140 lines
4.9 KiB
Markdown
140 lines
4.9 KiB
Markdown
## About
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GitHub Action to build and push Docker images.
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___
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* [Usage](#usage)
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* [Quick start](#quick-start)
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* [With Buildx](#with-buildx)
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* [Customizing](#customizing)
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* [inputs](#inputs)
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* [outputs](#outputs)
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* [Limitation](#limitation)
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## Usage
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### Quick start
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```yaml
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name: ci
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on:
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pull_request:
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branches: master
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push:
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branches: master
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tags:
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jobs:
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build:
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runs-on: ubuntu-latest
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steps:
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-
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name: Checkout
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uses: actions/checkout@v2
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name: Login to DockerHub
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uses: docker/login-action@v1
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with:
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username: ${{ secrets.DOCKER_USERNAME }}
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password: ${{ secrets.DOCKER_PASSWORD }}
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-
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name: Build and push
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uses: docker/build-push-action@v2
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with:
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tags: |
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user/app:latest
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user/app:1.0.0
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```
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### With Buildx
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You can also use our [setup-buildx](https://github.com/docker/setup-buildx-action) action that extends the
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`docker build` command with the full support of the features provided by
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[Moby BuildKit](https://github.com/moby/buildkit) builder toolkit to build multi-platform images.
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```yaml
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name: ci
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on:
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pull_request:
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branches: master
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push:
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branches: master
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tags:
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jobs:
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buildx:
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runs-on: ubuntu-latest
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steps:
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-
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name: Checkout
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uses: actions/checkout@v2
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-
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name: Set up QEMU
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uses: docker/setup-qemu-action@v1
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with:
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platforms: all
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-
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name: Set up Docker Buildx
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id: buildx
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uses: docker/setup-buildx-action@v1
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with:
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install: true
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-
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name: Login to DockerHub
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uses: docker/login-action@v1
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with:
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username: ${{ secrets.DOCKER_USERNAME }}
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password: ${{ secrets.DOCKER_PASSWORD }}
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-
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name: Build and push
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uses: docker/build-push-action@v2
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with:
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builder: ${{ steps.buildx.outputs.builder }}
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platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/386,linux/ppc64le,linux/s390x
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tags: |
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user/app:latest
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user/app:1.0.0
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```
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## Customizing
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### inputs
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Following inputs can be used as `step.with` keys
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| Name | Type | Default | Description |
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|---------------------|---------|-----------------------------------|------------------------------------|
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| `context` | String | `.` | Build's context is the set of files located in the specified `PATH` or `URL` |
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| `file` | String | `./Dockerfile` | Path to the Dockerfile. |
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| `build-args` | String | | Newline-delimited list of build-time variables |
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| `labels` | String | | Newline-delimited list of metadata for an image |
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| `tags` | String | | Newline-delimited list of tags **required** |
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| `pull` | Bool | `false` | Always attempt to pull a newer version of the image |
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| `target` | String | | Sets the target stage to build |
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| `no-cache` | Bool | `false` | Do not use cache when building the image |
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| `builder`**¹** | String | | Builder instance |
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| `platforms`**¹** | String | | Comma-delimited list of target platforms for build |
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| `load`**¹** | Bool | `false` | Shorthand for `--output=type=docker` |
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| `push` | Bool | `false` | Whether to push the built image (or shorthand for `--output=type=registry` if buildx used) |
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| `outputs`**¹** | String | | Newline-delimited list of output destinations (format: `type=local,dest=path`) |
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| `cache-from`**¹** | String | | Newline-delimited list of external cache sources (eg. `user/app:cache`, `type=local,src=path/to/dir`) |
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| `cache-to`**¹** | String | | Newline-delimited list of cache export destinations (eg. `user/app:cache`, `type=local,dest=path/to/dir`) |
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> **¹** Only available if [docker buildx](https://github.com/docker/buildx) is enabled.
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> See [setup-buildx](https://github.com/docker/setup-buildx-action) action for more info.
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### outputs
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Following outputs are available
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| Name | Type | Description |
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|---------------|---------|---------------------------------------|
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| `digest` | String | Image content-addressable identifier also called a digest |
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## Limitation
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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).
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