build-push-action/setup-buildx/README.md

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## About
GitHub Action to set up Docker [Buildx](https://github.com/docker/buildx).
___
* [Usage](#usage)
* [Quick start](#quick-start)
* [With QEMU](#with-qemu)
* [Customizing](#customizing)
* [inputs](#inputs)
* [outputs](#outputs)
* [environment variables](#environment-variables)
* [Limitation](#limitation)
## Usage
### 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 Docker Buildx
id: buildx
uses: docker/actions/setup-buildx@v1
with:
buildx-version: latest
-
name: Available platforms
run: echo ${{ steps.buildx.outputs.platforms }}
```
### With QEMU
If you want support for more platforms you can use our [setup-qemu](../setup-qemu) action:
```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/actions/setup-qemu@v1
with:
platforms: all
-
name: Set up Docker Buildx
id: buildx
uses: docker/actions/setup-buildx@v1
with:
buildx-version: latest
-
name: Builder instance name
run: echo ${{ steps.buildx.outputs.name }}
-
name: Available platforms
run: echo ${{ steps.buildx.outputs.platforms }}
```
## Customizing
### inputs
Following inputs can be used as `step.with` keys
| Name | Type | Default | Description |
|------------------|---------|-----------------------------------|------------------------------------|
| `buildx-version` | String | _the one installed on the runner_ | [Buildx](https://github.com/docker/buildx) version. e.g. `v0.3.0`, `latest` |
| `driver` | String | `docker-container` | Sets the [builder driver](https://github.com/docker/buildx#--driver-driver) to be used. |
| `driver-opt` | String | | Passes additional [driver-specific options](https://github.com/docker/buildx#--driver-opt-options). e.g. `image=moby/buildkit:master` |
| `install` | Bool | `false` | Sets up `docker build` command as an alias to `docker buildx` |
| `use` | Bool | `true` | Switch to this builder instance |
### outputs
Following outputs are available
| Name | Type | Description |
|---------------|---------|---------------------------------------|
| `name` | String | Builder instance name |
| `platforms` | String | Available platforms (comma separated) |
### environment variables
The following [official docker environment variables](https://docs.docker.com/engine/reference/commandline/cli/#environment-variables) are supported:
| Name | Type | Default | Description |
|-----------------|---------|-------------|-------------------------------------------------|
| `DOCKER_CONFIG` | String | `~/.docker` | The location of your client configuration files |
## 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).