new-release.yaml

name: Detect and build new upstream based release

on:
  workflow_dispatch:
    inputs:
      force_build:
        description: "Build even though there is no new upstream release."
        required: true
        default: false
        type: boolean

  push:
    tags: ["*"]

  schedule:
      # https://crontab.guru/#0_7_*_*_1-5
    - cron: "0 7 * * 1-5"

# permissions are needed if pushing to ghcr.io
permissions: 
  packages: write
  contents: write

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}
  NEW_BUILD: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.force_build == 'true' }}

jobs:
  trigger-from-upstream:
    runs-on: ubuntu-latest
    steps:
        # https://github.com/actions/checkout/?tab=readme-ov-file#usage
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
          # fetch-tags: true # Does not work for some reason, so we we use fetch-depth: 0

        # https://github.com/fut-infrastructure/ig-publisher/settings/variables/actions
      - name: Pipeline debug
        if: vars.DEBUG == 'true' 
        run: |
          echo "Files:"
          ls -lav
          echo "Git info:"
          git status -bv
          git branch -v
          echo "Log:"
          git log --oneline --decorate --graph
          echo "Tags:"
          git tag --sort=committerdate
          echo "SemVer tags:"
          git tag --sort=committerdate | grep -Eo '[0-9]{1,}.[0-9]{1,}.[0-9]{1,}' 
          echo "Environment variables:"
          env

      - name: Get the latest upstream release
        id: upstream
        run: |
          # https://docs.github.com/en/rest/releases/releases?#get-the-latest-release
          upstream_version=$(curl -s https://api.github.com/repos/HL7/fhir-ig-publisher/releases/latest | jq -r '.tag_name')
          # https://docs.github.com/en/actions/using-jobs/defining-outputs-for-jobs
          echo "upstream_version=$upstream_version" >> $GITHUB_OUTPUT
          echo "Found upstream release: \"$upstream_version\""

      - name: Get the latest FUT release
        id: fut
        env:
          name: ${{ env.IMAGE_NAME }}
        run: |
          # https://git-scm.com/docs/git-tag#Documentation/git-tag.txt---sortltkeygt
          # https://remarkablemark.org/blog/2023/04/15/how-to-grep-for-semver/
          fut_version=$(git tag --sort=committerdate \
            | grep -Eo '[0-9]{1,}.[0-9]{1,}.[0-9]{1,}' \
            | tail -1 \
            | sed 's/\\n//g') # Remove any newlines.
          echo "image_output=${name,,}" >> $GITHUB_OUTPUT
          echo "Latest SemVer tag: $fut_version"
          echo "fut_version=$fut_version" >> $GITHUB_OUTPUT
          echo "Found FUT release: \"$fut_version\""

      - name: Create tag for the new upstream release
        if: steps.upstream.outputs.upstream_version != steps.fut.outputs.fut_version
        run: |
          echo "Upstream output: ${{ steps.upstream.outputs.upstream_version }}"
          echo "FUT output: ${{ steps.fut.outputs.fut_version }}"
          echo "NEW_BUILD=true" >> $GITHUB_ENV
          git tag ${{ steps.upstream.outputs.upstream_version }}
          git push origin ${{ steps.upstream.outputs.upstream_version }}

      # https://github.com/docker/setup-qemu-action
      - name: Set up QEMU
        if: env.NEW_BUILD == 'true'
        uses: docker/setup-qemu-action@v3

      # https://github.com/docker/setup-buildx-action
      - name: Set up Docker Buildx
        if: env.NEW_BUILD == 'true'
        id: buildx
        uses: docker/setup-buildx-action@v3
        with:
          install: true

      - name: Login to GHCR
        if: env.NEW_BUILD == 'true'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Docker meta
        if: env.NEW_BUILD == 'true'
        id: meta # you'll use this in the next step
        uses: docker/metadata-action@v5
        with:
          # list of Docker images to use as base name for tags
          images: ${{ env.REGISTRY }}/${{ steps.fut.outputs.image_output }}
          # Docker tags based on the following events/attributes
          tags: |
            type=schedule
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=sha
            type=raw,latest
            type=semver,pattern={{version}},value=${{ steps.upstream.outputs.upstream_version }}

      - name: Build and push
        if: env.NEW_BUILD == 'true'
        id: docker_build
        uses: docker/build-push-action@v6
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          build-args: IG_PUB_VERSION=${{ steps.fut.outputs.fut_version }}
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          annotations: ${{ steps.meta.outputs.annotations }}
          cache-from: type=gha, scope=${{ github.workflow }}
          cache-to: type=gha, scope=${{ github.workflow }}