build-image.yaml

name: Build Image

on:
  workflow_call:
    inputs:
      image:
        description: 'Image name (for example: config-server)'
        required: true
        type: string
      description:
        description: 'Human-readable image description for PR comments'
        required: true
        type: string

jobs:
  build-push:
    name: Build and push image
    runs-on: ubuntu-latest
    env:
      TAG: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) || 'edge' }}
      REGISTRY: ${{ vars.DOCKER_REGISTRY }}

    steps:
    - name: Git checkout
      uses: actions/checkout@v6
      with:
        persist-credentials: false

    - name: Read image config
      id: config
      shell: bash
      run: echo "port=$(cat '${{ inputs.image }}/metadata/PORT' | tr -d '[:space:]')" >> $GITHUB_OUTPUT

    - name: Set up JDK 25
      if: inputs.image != 'uaa-server'
      uses: actions/setup-java@v5
      with:
        distribution: temurin
        java-version: '25'
        cache: gradle

    - name: Build image
      shell: pwsh
      run: ./build.ps1 -Name '${{ inputs.image }}' -Registry '${{ env.REGISTRY }}' -Tag '${{ env.TAG }}'

    - name: Smoke test image
      shell: pwsh
      run: ./smoke-test.ps1 -Name '${{ inputs.image }}' -Registry '${{ env.REGISTRY }}' -Tag '${{ env.TAG }}'

    - name: Login to container registry
      uses: docker/login-action@v4
      with:
        registry: ${{ env.REGISTRY }}
        username: ${{ secrets.DOCKER_USERNAME }}
        password: ${{ secrets.DOCKER_PASSWORD }}

    - name: Push image
      run: docker push ${{ env.REGISTRY }}/${{ inputs.image }}:${{ env.TAG }}

    - name: Post or update PR comment with image run instructions
      uses: actions/github-script@v9
      if: ${{ github.event_name == 'pull_request' }}
      with:
        script: |
          const marker = '<!-- IMAGE_INSTRUCTIONS_${{ inputs.image }} -->';
          const body = `${marker}
          To run the ${{ inputs.description }} image built for this pull request:
          \`\`\`bash
          docker run --rm -d --pull=always -p ${{ steps.config.outputs.port }}:${{ steps.config.outputs.port }} --name ${{ inputs.image }}-pr ${{ env.REGISTRY }}/${{ inputs.image }}:${{ env.TAG }}
          \`\`\``;

          const { data: comments } = await github.rest.issues.listComments({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: context.issue.number,
            per_page: 100,
          });

          const existingComment = comments.find(comment =>
            comment.user.login === 'github-actions[bot]' && comment.body.startsWith(marker)
          );

          if (existingComment) {
            await github.rest.issues.updateComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              comment_id: existingComment.id,
              body: body,
            });
          } else {
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: body,
            });
          }