[![GitHub release](https://img.shields.io/github/release/docker/build-push-action.svg?style=flat-square)](https://github.com/docker/build-push-action/releases/latest) [![GitHub marketplace](https://img.shields.io/badge/marketplace-build--and--push--docker--images-blue?logo=github&style=flat-square)](https://github.com/marketplace/actions/build-and-push-docker-images) [![CI workflow](https://img.shields.io/github/workflow/status/docker/build-push-action/ci?label=ci&logo=github&style=flat-square)](https://github.com/docker/build-push-action/actions?workflow=ci) [![Test workflow](https://img.shields.io/github/workflow/status/docker/build-push-action/test?label=test&logo=github&style=flat-square)](https://github.com/docker/build-push-action/actions?workflow=test) [![Codecov](https://img.shields.io/codecov/c/github/docker/build-push-action?logo=codecov&style=flat-square)](https://codecov.io/gh/docker/build-push-action) ## About GitHub Action to build and push Docker images with [Buildx](https://github.com/docker/buildx) with full support of the features provided by [Moby BuildKit](https://github.com/moby/buildkit) builder toolkit. This includes multi-platform build, secrets, remote cache, etc. and different builder deployment/namespacing options. ![Screenshot](.github/build-push-action.png) ___ * [Usage](#usage) * [Git context](#git-context) * [Path context](#path-context) * [Advanced usage](#advanced-usage) * [Multi-platform image](docs/advanced/multi-platform.md) * [Secrets](docs/advanced/secrets.md) * [Isolated builders](docs/advanced/isolated-builders.md) * [Push to multi-registries](docs/advanced/push-multi-registries.md) * [Copy between registries](docs/advanced/copy-between-registries.md) * [Cache](docs/advanced/cache.md) * [Local registry](docs/advanced/local-registry.md) * [Export image to Docker](docs/advanced/export-docker.md) * [Share built image between jobs](docs/advanced/share-image-jobs.md) * [Test your image before pushing it](docs/advanced/test-before-push.md) * [Named contexts](docs/advanced/named-contexts.md) * [Handle tags and labels](docs/advanced/tags-labels.md) * [Update DockerHub repo description](docs/advanced/dockerhub-desc.md) * [Customizing](#customizing) * [inputs](#inputs) * [outputs](#outputs) * [Troubleshooting](#troubleshooting) * [Keep up-to-date with GitHub Dependabot](#keep-up-to-date-with-github-dependabot) ## Usage In the examples below we are also using 3 other actions: * [`setup-buildx`](https://github.com/docker/setup-buildx-action) action will create and boot a builder using by default the `docker-container` [builder driver](https://github.com/docker/buildx/blob/master/docs/reference/buildx_create.md#driver). This is **not required but recommended** using it to be able to build multi-platform images, export cache, etc. * [`setup-qemu`](https://github.com/docker/setup-qemu-action) action can be useful if you want to add emulation support with QEMU to be able to build against more platforms. * [`login`](https://github.com/docker/login-action) action will take care to log in against a Docker registry. ### Git context By default, this action uses the [Git context](https://docs.docker.com/engine/reference/commandline/build/#git-repositories), so you don't need to use the [`actions/checkout`](https://github.com/actions/checkout/) action to check out the repository as this will be done directly by [BuildKit](https://github.com/moby/buildkit). The git reference will be based on the [event that triggered your workflow](https://docs.github.com/en/actions/reference/events-that-trigger-workflows) and will result in the following context: `https://github.com//.git#`. ```yaml name: ci on: push: branches: - 'main' jobs: docker: runs-on: ubuntu-latest steps: - name: Set up QEMU uses: docker/setup-qemu-action@v2 - name: Set up Docker Buildx uses: docker/setup-buildx-action@v2 - name: Login to DockerHub uses: docker/login-action@v2 with: username: ${{ secrets.DOCKERHUB_USERNAME }} password: ${{ secrets.DOCKERHUB_TOKEN }} - name: Build and push uses: docker/build-push-action@v3 with: push: true tags: user/app:latest ``` Be careful because **any file mutation in the steps that precede the build step will be ignored, including processing of the `.dockerignore` file** since the context is based on the Git reference. However, you can use the [Path context](#path-context) using the [`context` input](#inputs) alongside the [`actions/checkout`](https://github.com/actions/checkout/) action to remove this restriction. Default Git context can also be provided using the [Handlebars template](https://handlebarsjs.com/guide/) expression `{{defaultContext}}`. Here we can use it to provide a subdirectory to the default Git context: ```yaml - # Setting up Docker Buildx with docker-container driver is required # at the moment to be able to use a subdirectory with Git context name: Set up Docker Buildx uses: docker/setup-buildx-action@v2 - name: Build and push uses: docker/build-push-action@v3 with: context: "{{defaultContext}}:mysubdir" push: true tags: user/app:latest ``` > **Warning** > > Subdirectory for Git context is available from [BuildKit v0.9.0](https://github.com/moby/buildkit/releases/tag/v0.9.0). > If you're using the `docker` builder (default if `setup-buildx-action` not used), > then BuildKit in Docker Engine will be used. As Docker Engine < v22.x.x embeds > Buildkit 0.8.2 at the moment, it does not support this feature. It's therefore > required to use the `setup-buildx-action` at the moment. Building from the current repository automatically uses the [GitHub Token](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token), so it does not need to be passed. If you want to authenticate against another private repository, you have to use a [secret](docs/advanced/secrets.md) named `GIT_AUTH_TOKEN` to be able to authenticate against it with buildx: ```yaml - name: Build and push uses: docker/build-push-action@v3 with: push: true tags: user/app:latest secrets: | GIT_AUTH_TOKEN=${{ secrets.MYTOKEN }} ``` ### Path context ```yaml name: ci on: push: branches: - 'main' jobs: docker: runs-on: ubuntu-latest steps: - name: Checkout uses: actions/checkout@v3 - name: Set up QEMU uses: docker/setup-qemu-action@v2 - name: Set up Docker Buildx uses: docker/setup-buildx-action@v2 - name: Login to DockerHub uses: docker/login-action@v2 with: username: ${{ secrets.DOCKERHUB_USERNAME }} password: ${{ secrets.DOCKERHUB_TOKEN }} - name: Build and push uses: docker/build-push-action@v3 with: context: . push: true tags: user/app:latest ``` ## Advanced usage * [Multi-platform image](docs/advanced/multi-platform.md) * [Secrets](docs/advanced/secrets.md) * [Isolated builders](docs/advanced/isolated-builders.md) * [Push to multi-registries](docs/advanced/push-multi-registries.md) * [Copy between registries](docs/advanced/copy-between-registries.md) * [Cache](docs/advanced/cache.md) * [Local registry](docs/advanced/local-registry.md) * [Export image to Docker](docs/advanced/export-docker.md) * [Share built image between jobs](docs/advanced/share-image-jobs.md) * [Test your image before pushing it](docs/advanced/test-before-push.md) * [Named contexts](docs/advanced/named-contexts.md) * [Handle tags and labels](docs/advanced/tags-labels.md) * [Update DockerHub repo description](docs/advanced/dockerhub-desc.md) ## Customizing ### inputs Following inputs can be used as `step.with` keys > `List` type is a newline-delimited string > ```yaml > cache-from: | > user/app:cache > type=local,src=path/to/dir > ``` > `CSV` type is a comma-delimited string > ```yaml > tags: name/app:latest,name/app:1.0.0 > ``` | Name | Type | Description | |--------------------|----------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `add-hosts` | List/CSV | List of [customs host-to-IP mapping](https://docs.docker.com/engine/reference/commandline/build/#add-entries-to-container-hosts-file---add-host) (e.g., `docker:10.180.0.1`) | | `allow` | List/CSV | List of [extra privileged entitlement](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#allow) (e.g., `network.host,security.insecure`) | | `builder` | String | Builder instance (see [setup-buildx](https://github.com/docker/setup-buildx-action) action) | | `build-args` | List | List of [build-time variables](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#build-arg) | | `build-contexts` | List | List of additional [build contexts](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#build-context) (e.g., `name=path`) | | `cache-from` | List | List of [external cache sources](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#cache-from) (e.g., `type=local,src=path/to/dir`) | | `cache-to` | List | List of [cache export destinations](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#cache-to) (e.g., `type=local,dest=path/to/dir`) | | `cgroup-parent` | String | Optional [parent cgroup](https://docs.docker.com/engine/reference/commandline/build/#use-a-custom-parent-cgroup---cgroup-parent) for the container used in the build | | `context` | String | Build's context is the set of files located in the specified [`PATH` or `URL`](https://docs.docker.com/engine/reference/commandline/build/) (default [Git context](#git-context)) | | `file` | String | Path to the Dockerfile. (default `{context}/Dockerfile`) | | `labels` | List | List of metadata for an image | | `load` | Bool | [Load](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#load) is a shorthand for `--output=type=docker` (default `false`) | | `network` | String | Set the networking mode for the `RUN` instructions during build | | `no-cache` | Bool | Do not use cache when building the image (default `false`) | | `no-cache-filters` | List/CSV | Do not cache specified stages | | `outputs` | List | List of [output destinations](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#output) (format: `type=local,dest=path`) | | `platforms` | List/CSV | List of [target platforms](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#platform) for build | | `pull` | Bool | Always attempt to pull all referenced images (default `false`) | | `push` | Bool | [Push](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#push) is a shorthand for `--output=type=registry` (default `false`) | | `secrets` | List | List of [secrets](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#secret) to expose to the build (e.g., `key=string`, `GIT_AUTH_TOKEN=mytoken`) | | `secret-files` | List | List of [secret files](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#secret) to expose to the build (e.g., `key=filename`, `MY_SECRET=./secret.txt`) | | `shm-size` | String | Size of [`/dev/shm`](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#-size-of-devshm---shm-size) (e.g., `2g`) | | `ssh` | List | List of [SSH agent socket or keys](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#ssh) to expose to the build | | `tags` | List/CSV | List of tags | | `target` | String | Sets the target stage to build | | `ulimit` | List | [Ulimit](https://github.com/docker/buildx/blob/master/docs/reference/buildx_build.md#-set-ulimits---ulimit) options (e.g., `nofile=1024:1024`) | | `github-token` | String | GitHub Token used to authenticate against a repository for [Git context](#git-context) (default `${{ github.token }}`) | ### outputs Following outputs are available | Name | Type | Description | |------------|---------|-----------------------------------------| | `imageid` | String | Image ID | | `digest` | String | Image digest | | `metadata` | JSON | Build result metadata | ## Troubleshooting See [TROUBLESHOOTING.md](TROUBLESHOOTING.md) ## Keep up-to-date with GitHub Dependabot Since [Dependabot](https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-github-dependabot) has [native GitHub Actions support](https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates#package-ecosystem), to enable it on your GitHub repo all you need to do is add the `.github/dependabot.yml` file: ```yaml version: 2 updates: # Maintain dependencies for GitHub Actions - package-ecosystem: "github-actions" directory: "/" schedule: interval: "daily" ```