feat: Added docker-build-action

[christian-kreuzberger-dtx]

This PR

• Adds reusable docker-build action

Example usage 1:

  docker_build:
    name: Docker Build
    runs-on: ubuntu-20.04
    env:
      VERSION: 1.0.1
    steps:
      - name: Checkout Code
        uses: actions/[email protected]

      - name: Docker Build Service
        id: docker_build_service
        uses: keptn/gh-automation/.github/actions/docker-build@feature/docker-build
        with:
          TAGS: |
            ${{ env.DOCKER_ORGANIZATION }}/${{ env.IMAGE }}:${{ env.VERSION }}
            ${{ env.DOCKER_ORGANIZATION }}/${{ env.IMAGE }}:${{ env.VERSION }}.${{ env.DATETIME }}
          BUILD_ARGS: |
            version=${{ env.VERSION }}
            datetime=${{ env.DATETIME }}
          REGISTRY_USER: ${{ secrets.REGISTRY_USER }}
          REGISTRY_PASSWORD: ${{ secrets.REGISTRY_PASSWORD }}

      - name: Docker Build Initcontainer
        id: docker_build_initcontainer
        uses: keptn/gh-automation/.github/actions/docker-build@feature/docker-build
        with:
          TAGS: |
            ${{ env.DOCKER_ORGANIZATION }}/${{ env.IMAGE_INITCONTAINER }}:${{ env.VERSION }}
            ${{ env.DOCKER_ORGANIZATION }}/${{ env.IMAGE_INITCONTAINER }}:${{ env.VERSION }}.${{ env.DATETIME }}
          BUILD_ARGS: |
            version=${{ env.VERSION }}
            datetime=${{ env.DATETIME }}
          REGISTRY_USER: ${{ secrets.REGISTRY_USER }}
          REGISTRY_PASSWORD: ${{ secrets.REGISTRY_PASSWORD }}
          DOCKERFILE: ${{ env.DOCKERFILE_INITCONTAINER }}

Example usage 2:

      - name: Docker Build
        id: docker_build
        uses: keptn/gh-automation/.github/actions/docker-build@feature/docker-build
        with:
          TAGS: |
            ${{ env.DOCKER_ORGANIZATION }}/${{ env.IMAGE }}:${{ env.VERSION }}
            ghcr.io/${{ github.repository_owner }}/${{ env.IMAGE }}:${{ env.VERSION }}
          BUILD_ARGS: |
            version=${{ env.VERSION }}
            datetime=${{ env.DATETIME }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REGISTRY_USER: ${{ secrets.REGISTRY_USER }}
          REGISTRY_PASSWORD: ${{ secrets.REGISTRY_PASSWORD }}

      - id: report_docker_build_to_pr
        name: Report Docker Build to PR
        if: (github.event_name == 'pull_request')
        uses: marocchino/[email protected]
        with:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          recreate: true
          header: test
          message: |
            ```
            ${{ steps.docker_build.outputs.BUILD_METADATA }}
            ```