GH Action to Build Docker Images (with some Keptn internal stuff)

This repo provides a utility GitHub action for the CI Workflow in the Keptn Project. Nevertheless, this action provides a very basic functionality, as in "Build a docker image and do some sanity checks".

Inputs

• IMAGE_NAME - name of the image (including the docker organization)
• DOCKER_FOLDER (optional, defaults to './') - folder where Dockerfile is in; needs a trailing slash
• VERSION - semantic version used as the tag for the resulting image
• DATETIME (optional) - in case you want to build multiple images and refer to them with the same datetime string, e.g., YYYYMMDDHHmmss; (defaults to DATETIME=$(date +'%Y%m%d%H%M'))
• FILE (optional, defaults to 'Dockerfile') - name of the Dockerfile

Outputs

None at the moment

Example usage

Simple Example

    env:
      VERSION: "1.2.3"
    steps:
      - name: Checkout Code
        uses: actions/checkout@v2

      - id: docker_login
        name: Docker Login
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.REGISTRY_USER }}
          password: ${{ secrets.REGISTRY_PASSWORD }}

      - id: docker_build
        name: Docker Build
        uses: keptn/gh-action-build-docker-image@master
        with:
          PLATFORMS: ${{ env.DOCKER_PLATFORMS }}
          VERSION: ${{ env.VERSION }}
          IMAGE_NAME: "yourdockerorg/yourimagename"

Extended Example

    env:
      VERSION: "1.2.3"
    steps:
      - name: Checkout Code
        uses: actions/checkout@v2

      - id: docker_login
        name: Docker Login
        # only run docker login on pushes; also for PRs, but only if this is not a fork
        if: (github.event_name == 'push') || (github.event.pull_request.head.repo.full_name == github.repository)
        # note: GH does not allow to access secrets for PRs from a forked repositories due to security reasons
        # that's fine, but it means we can't push images to dockerhub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.REGISTRY_USER }}
          password: ${{ secrets.REGISTRY_PASSWORD }}

      - id: docker_build
        name: Docker Build
        uses: keptn/gh-action-build-docker-image@master
        with:
          PLATFORMS: "linux/amd64,linux/arm/v7,linux/arm64"
          VERSION: ${{ env.VERSION }}
          IMAGE_NAME: "yourdockerorg/yourimagename"
          DOCKER_FOLDER: "your-sub-directory/"
          FILE: "your-dockerfile.Dockerfile"