Validating build configuration with GitHub Actions

Build checks let you validate your 
docker build
configuration without actually running the build.
Run checks with 
docker/build-push-action
To run build checks in a GitHub Actions workflow with the 
build-push-action,
set the 
call input parameter to 
check. With this set, the workflow fails if
any check warnings are detected for your build's configuration.
name: ci
on:
  push:
jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Login to Docker Hub
        uses: docker/login-action@{{% param "login_action_version" %}}
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@{{% param "setup_buildx_action_version" %}}
      - name: Validate build configuration
        uses: docker/build-push-action@{{% param "build_push_action_version" %}}
        with:
          call: check
      - name: Build and push
        uses: docker/build-push-action@{{% param "build_push_action_version" %}}
        with:
          push: true
          tags: user/app:latest
Run checks with 
docker/bake-action
If you're using Bake and 
docker/bake-action to run your builds, you don't
need to specify any special inputs in your GitHub Actions workflow
configuration. Instead, define a Bake target that calls the 
check method,
and invoke that target in your CI.
target "build" {
  dockerfile = "Dockerfile"
  args = {
    FOO = "bar"
  }
}
target "validate-build" {
  inherits = ["build"]
  call = "check"
}
name: ci
on:
  push:
env:
  IMAGE_NAME: user/app
jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Login to Docker Hub
        uses: docker/login-action@{{% param "login_action_version" %}}
        with:
          username: ${{ vars.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@{{% param "setup_buildx_action_version" %}}
      - name: Validate build configuration
        uses: docker/bake-action@{{% param "bake_action_version" %}}
        with:
          targets: validate-build
      - name: Build
        uses: docker/bake-action@{{% param "bake_action_version" %}}
        with:
          targets: build
          push: true
Using the 
call input directly
You can also set the build method with the 
call input which is equivalent to using the 
--call flag with 
docker buildx bake
For example, to run a check without defining 
call in your Bake file:
name: ci
on:
  push:
jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@{{% param "setup_buildx_action_version" %}}
      - name: Validate build configuration
        uses: docker/bake-action@{{% param "bake_action_version" %}}
        with:
          targets: build
          call: check