docker-image-exists-github.yaml

---
name: check if docker image exists in github

on:
  workflow_call:
    inputs:
      runner:
        description: '["some-runners"]'
        required: true
        type: string
      registry:
        description: "registry url"
        required: false
        type: string
        default: "ghcr.io"
      subpath:
        description: "subpath to image name, f.e. integration/app-name"
        required: true
        type: string
      tag:
        description: "tag for image - default sha"
        required: false
        type: string
        default: ${{ github.sha }}

    outputs:
      tag:
        description: "found || not found"
        value: ${{ jobs.check-image-exists.outputs.tag }}

jobs:
  check-image-exists:
    name: github
    runs-on: ${{fromJSON(inputs.runner)}}
    permissions:
      contents: read
      packages: read
    env:
      image-path: ${{ inputs.registry }}/${{ github.repository }}/${{ inputs.subpath }}
    outputs:
      tag: ${{ steps.inspect.outputs.tag }}

    steps:
      # https://github.com/marketplace/actions/docker-login
      - name: log into registry
        uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9 # v3.7.0
        with:
          registry: ${{ inputs.registry }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # https://github.com/marketplace/actions/docker-image-tag-exists
      - name: inspect
        id: inspect
        uses: tyriis/docker-image-tag-exists@71a750a41aa78e4efb0842f538140c5df5b8166f # v2.1.0
        with:
          registry: ${{ inputs.registry }}
          repository: ${{ github.repository }}/${{ inputs.subpath }}
          tag: ${{ inputs.tag }}