docker-setup-buildx/README.md

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## About
GitHub Action to set up Docker [Buildx](https://github.com/docker/buildx).
This action will create and boot a builder that can be used in the following steps of your workflow if you're using
[buildx](https://github.com/docker/buildx). By default, the `docker-container` [builder driver](https://github.com/docker/buildx/blob/master/docs/reference/buildx_create.md#driver)
will be used to be able to build multi-platform images and export cache thanks to the [BuildKit](https://github.com/moby/buildkit)
container.
![Screenshot](.github/setup-buildx-action.png)
___
* [Usage](#usage)
* [Quick start](#quick-start)
* [With QEMU](#with-qemu)
* [Install by default](#install-by-default)
* [Customizing](#customizing)
* [inputs](#inputs)
* [outputs](#outputs)
* [environment variables](#environment-variables)
* [Notes](#notes)
* [BuildKit container logs](#buildkit-container-logs)
* [Keep up-to-date with GitHub Dependabot](#keep-up-to-date-with-github-dependabot)
## Usage
### Quick start
```yaml
name: ci
on:
push:
jobs:
buildx:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
name: Set up Docker Buildx
id: buildx
uses: docker/setup-buildx-action@v1
-
name: Inspect builder
run: |
echo "Name: ${{ steps.buildx.outputs.name }}"
echo "Endpoint: ${{ steps.buildx.outputs.endpoint }}"
echo "Status: ${{ steps.buildx.outputs.status }}"
echo "Flags: ${{ steps.buildx.outputs.flags }}"
echo "Platforms: ${{ steps.buildx.outputs.platforms }}"
```
### With QEMU
If you want support for more platforms you can use our [setup-qemu](https://github.com/docker/setup-qemu-action) action:
```yaml
name: ci
on:
push:
jobs:
buildx:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
name: Set up QEMU
uses: docker/setup-qemu-action@v1
-
name: Set up Docker Buildx
id: buildx
uses: docker/setup-buildx-action@v1
-
name: Available platforms
run: echo ${{ steps.buildx.outputs.platforms }}
```
### Install by default
Implemented with https://github.com/docker/buildx#setting-buildx-as-default-builder-in-docker-1903
```yaml
name: ci
on:
push:
jobs:
buildx:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
uses: docker/setup-buildx-action@v1
id: buildx
with:
install: true
-
name: Build
run: |
docker build . # will run buildx
```
## Customizing
### inputs
Following inputs can be used as `step.with` keys
| Name | Type | Description |
|--------------------|---------|-----------------------------------|
| `version` | String | [buildx](https://github.com/docker/buildx) version. (eg. `v0.3.0`, `latest`, `https://github.com/docker/buildx.git#master`) |
| `driver` | String | Sets the [builder driver](https://github.com/docker/buildx/blob/master/docs/reference/buildx_create.md#driver) to be used (default `docker-container`) |
| `driver-opts` | CSV | List of additional [driver-specific options](https://github.com/docker/buildx/blob/master/docs/reference/buildx_create.md#driver-opt) (eg. `image=moby/buildkit:master`) |
| `buildkitd-flags` | String | [Flags for buildkitd](https://github.com/moby/buildkit/blob/master/docs/buildkitd.toml.md) daemon (since [buildx v0.3.0](https://github.com/docker/buildx/releases/tag/v0.3.0)) |
| `install` | Bool | Sets up `docker build` command as an alias to `docker buildx` (default `false`) |
| `use` | Bool | Switch to this builder instance (default `true`) |
| `endpoint` | String | [Optional address for docker socket](https://github.com/docker/buildx/blob/master/docs/reference/buildx_create.md#description) or context from `docker context ls` |
| `config` | String | [BuildKit config file](https://github.com/docker/buildx/blob/master/docs/reference/buildx_create.md#config) |
> `CSV` type must be a newline-delimited string
> ```yaml
> driver-opts: image=moby/buildkit:master
> ```
> ```yaml
> driver-opts: |
> image=moby/buildkit:master
> network=host
> ```
### outputs
Following outputs are available
| Name | Type | Description |
|---------------|---------|---------------------------------------|
| `name` | String | Builder name |
| `driver` | String | Builder driver |
| `endpoint` | String | Builder node endpoint |
| `status` | String | Builder node status |
| `flags` | String | Builder node flags (if applicable) |
| `platforms` | String | Builder node platforms available (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 |
## Notes
### BuildKit container logs
To display BuildKit container logs (when `docker-container` driver is used) you have to [enable step debug logging](https://docs.github.com/en/actions/managing-workflow-runs/enabling-debug-logging#enabling-step-debug-logging)
or you can also enable debugging in the [setup-buildx action step](https://github.com/docker/setup-buildx-action):
```yaml
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v1
with:
buildkitd-flags: --debug
```
Logs will be available at the end of a job:
![BuildKit container logs](.github/buildkit-container-logs.png)
## 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"
```