build-push-action/README.md

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## About
GitHub Action to build and push Docker images.
___
* [Usage](#usage)
* [Quick start](#quick-start)
* [Customizing](#customizing)
* [inputs](#inputs)
* [outputs](#outputs)
* [Limitation](#limitation)
## Usage
This action uses our [setup-buildx](https://github.com/docker/setup-buildx-action) action that extends the
`docker build` command named [buildx](https://github.com/docker/buildx) with the full support of the features
provided by [Moby BuildKit](https://github.com/moby/buildkit) builder toolkik. This includes multi-arch build,
build-secrets, remote cache, etc. and different builder deployment/namespacing options.
### Quick start
```yaml
name: ci
on:
pull_request:
branches: master
push:
branches: master
tags:
jobs:
buildx:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
name: Set up QEMU
uses: docker/setup-qemu-action@v1
with:
platforms: all
-
name: Set up Docker Buildx
id: buildx
uses: docker/setup-buildx-action@v1
with:
install: true
-
name: Login to DockerHub
uses: docker/login-action@v1
with:
username: ${{ secrets.DOCKER_USERNAME }}
password: ${{ secrets.DOCKER_PASSWORD }}
-
name: Build and push
uses: docker/build-push-action@v2
with:
builder: ${{ steps.buildx.outputs.name }}
platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/386,linux/ppc64le,linux/s390x
push: true
tags: |
user/app:latest
user/app:1.0.0
```
## Customizing
### inputs
Following inputs can be used as `step.with` keys
| Name | Type | Default | Description |
|---------------------|---------|-----------------------------------|------------------------------------|
| `builder` | String | | Builder instance |
| `context` | String | `.` | Build's context is the set of files located in the specified `PATH` or `URL` |
| `file` | String | `./Dockerfile` | Path to the Dockerfile. |
| `build-args` | String | | Newline-delimited list of build-time variables |
| `labels` | String | | Newline-delimited list of metadata for an image |
| `tags` | String | | Newline-delimited list of tags **required** |
| `pull` | Bool | `false` | Always attempt to pull a newer version of the image |
| `target` | String | | Sets the target stage to build |
| `no-cache` | Bool | `false` | Do not use cache when building the image |
| `platforms` | String | | Comma-delimited list of target platforms for build |
| `load` | Bool | `false` | Shorthand for `--output=type=docker` |
| `push` | Bool | `false` | Shorthand for `--output=type=registry` |
| `outputs` | String | | Newline-delimited list of output destinations (format: `type=local,dest=path`) |
| `cache-from` | String | | Newline-delimited list of external cache sources (eg. `user/app:cache`, `type=local,src=path/to/dir`) |
| `cache-to` | String | | Newline-delimited list of cache export destinations (eg. `user/app:cache`, `type=local,dest=path/to/dir`) |
### outputs
Following outputs are available
| Name | Type | Description |
|---------------|---------|---------------------------------------|
| `digest` | String | Image content-addressable identifier also called a digest |
## Limitation
This action is only available for Linux [virtual environments](https://help.github.com/en/articles/virtual-environments-for-github-actions#supported-virtual-environments-and-hardware-resources).