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build-push-action/README.md

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[![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)
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[![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)
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## 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)
* [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](#git-context) so you don't need
to use the [`actions/checkout`](https://github.com/actions/checkout/) action to
check out the repository because 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/<owner>/<repo>.git#<ref>`.
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Set up QEMU
uses: docker/setup-qemu-action@v1
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v1
-
name: Login to DockerHub
uses: docker/login-action@v1
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v2
with:
push: true
tags: user/app:latest
```
Be careful because **any file mutation in the steps that precede the build step
will be ignored, including processing of the `.dockerignore` file** since
the context is based on the Git reference. However, you can use the
[Path context](#path-context) using the [`context` input](#inputs) alongside
the [`actions/checkout`](https://github.com/actions/checkout/) action to remove
this restriction.
Default Git context can also be provided using the [Handlebars template](https://handlebarsjs.com/guide/)
expression `{{defaultContext}}`. Here we can use it to provide a subdirectory
to the default Git context:
```yaml
-
name: Build and push
uses: docker/build-push-action@v2
with:
context: "{{defaultContext}}:mysubdir"
push: true
tags: user/app:latest
```
> :warning: Subdirectory for Git context is not yet available for the buildx [`docker` driver](https://github.com/docker/buildx/blob/master/docs/reference/buildx_create.md#driver).
Building from the current repository automatically uses the [GitHub Token](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token)
so it does not need to be passed. If you want to authenticate against another
private repository, you have to use a [secret](docs/advanced/secrets.md) named
`GIT_AUTH_TOKEN` to be able to authenticate against it with buildx:
```yaml
-
name: Build and push
uses: docker/build-push-action@v2
with:
push: true
tags: user/app:latest
secrets: |
GIT_AUTH_TOKEN=${{ secrets.MYTOKEN }}
```
### Path context
```yaml
name: ci
on:
push:
branches:
- 'main'
jobs:
docker:
runs-on: ubuntu-latest
steps:
-
name: Checkout
uses: actions/checkout@v2
-
name: Set up QEMU
uses: docker/setup-qemu-action@v1
-
name: Set up Docker Buildx
uses: docker/setup-buildx-action@v1
-
name: Login to DockerHub
uses: docker/login-action@v1
with:
username: ${{ secrets.DOCKERHUB_USERNAME }}
password: ${{ secrets.DOCKERHUB_TOKEN }}
-
name: Build and push
uses: docker/build-push-action@v2
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)
* [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 |
|---------------------|----------|------------------------------------|
| `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 |
| `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`¹ | 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`) |
| `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 a newer version of the image (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 to expose to the build (e.g., `key=string`, `GIT_AUTH_TOKEN=mytoken`) |
| `secret-files` | List | List of secret files to expose to the build (e.g., `key=filename`, `MY_SECRET=./secret.txt`) |
| `shm-size`¹ | 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 to expose to the build |
| `tags` | List/CSV | List of tags |
| `target` | String | Sets the target stage to build |
| `ulimit`¹ | 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 }}`) |
> ¹ `cgroup-parent`, `shm-size` and `ulimit` are only available using `moby/buildkit:master`
> as builder image atm:
> ```yaml
> - name: Set up Docker Buildx
> uses: docker/setup-buildx-action@v1
> with:
> driver-opts: |
> image=moby/buildkit:master
> ```
### outputs
Following outputs are available
| Name | Type | Description |
|-------------------|---------|---------------------------------------|
| `digest` | String | Image content-addressable identifier also called a 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"
```
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