name: Merge and push
description: Apply meta, create manifest, and push to container registry

inputs:
  imagename:
    required: true
    description: The name of the image to push
  platform:
    required: true
    description: The platform to push the image for

runs:
  using: "composite"
  steps:
    -
      name: Docker meta
      id: meta_docker
      uses: docker/metadata-action@v4
      with:
        images: |
          ${{ inputs.imagename }},enable=${{ github.event_name != 'pull_request' && github.event_name != 'workflow_dispatch' }}
          foo/bar,enable=${{ github.event_name == 'pull_request' }}
        # We want to tag the image with the latest tag if the workflow was triggered by a tag
        flavor: |
          latest=${{ startsWith(github.ref, 'refs/tags/') }}
        # tags:
          # type=schedule means that a tag is applied when the workflow is triggered by a schedule event
          # type=ref,event=branch means that a tag is applied when the workflow is triggered by a push to a branch
          # type=ref,event=tag means that a tag is applied when the workflow is triggered by a push to a tag
        tags: |
          type=schedule,suffix=-${{ inputs.platform }},enable=${{ github.event_name == 'schedule' }}
          type=ref,event=branch,suffix=-${{ inputs.platform }},enable=${{ github.event_name != 'schedule' }}
          type=ref,event=tag,suffix=-${{ inputs.platform }}
    -
      name: Create manifest list and push to repository
      working-directory: /tmp/digests/dockerhub/${{ inputs.platform }}
      # When using composite actions, you have to specify the shell. As you
      # don’t specify a runner type in composite actions, you need to specify
      # the shell instead for each action.
      shell: bash
      run: |
        docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
          $(printf '${{ inputs.imagename }}@sha256:%s ' *)
    -
      name: Inspect image
      shell: bash
      run: |
        docker buildx imagetools inspect ${{ inputs.imagename }}:${{ steps.meta_docker.outputs.version }}