build.yml

name: Build

on:
  push:

jobs:

  build: # to work as an action out of the box the ncc-build must be committed
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - uses: bahmutov/npm-install@v1
    - run: yarn build

    - run: git add -f build

    - name: Commit build if it changed
      run: >
        git diff --staged --quiet
        || (git config user.name "github-actions"
        && git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
        && git commit -m "build: autoupdate"
        && echo "buildCommit=$(git rev-parse HEAD)" >>$GITHUB_ENV)

    - if: env.buildCommit # skip if the build adds nothing new
      name: Push build branch
      run: git push -f origin HEAD:build

    outputs:
      buildCommit: ${{ env.buildCommit }}

  verify:
    needs: build
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
      with:
        ref: ${{ needs.build.outputs.buildCommit }} # if there is no buildCommit, checkout HEAD
    - name: Dry-run
      uses: ./
      with:
        dry: true
        debug: true

    # if there is a buildCommit, push it back onto the branch that triggered the workflow
    - if: needs.build.outputs.buildCommit
      id: helper
      uses: ph-fritsche/action-helper@master
    - if: needs.build.outputs.buildCommit
      name: Push back to original branch
      run: |
        git fetch --depth=2 origin ${{ needs.build.outputs.buildCommit }}
        git log --format=oneline -n2 ${{ needs.build.outputs.buildCommit }}
        git push -v origin ${{ needs.build.outputs.buildCommit }}:${{ steps.helper.outputs.branchName }}

  release:
    needs: [build, verify]
    if: contains('refs/heads/master,refs/heads/beta,refs/heads/next,refs/heads/alpha', github.ref)
    runs-on: ubuntu-latest
    steps:
    - id: helper
      uses: ph-fritsche/action-helper@master
    - uses: actions/checkout@v2
      with:
        ref: ${{ steps.helper.outputs.branchName }}
    - name: Ensure branch HEAD did not move
      run: |
        EXPECTED="${{ needs.build.outputs.buildCommit || github.sha }}"
        ACTUAL="$(git rev-parse HEAD)"
        if [ $ACTUAL != $EXPECTED ]; then
          echo "::error ::HEAD moved to ${ACTUAL} - expected ${EXPECTED}"
          exit 1
        fi
    - id: release
      name: Dogfooding release
      uses: ./
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
    - name: Add check to the build
      uses: actions/github-script@v3
      with:
        script: |
          const [owner, repo] = "${{ github.repository }}".split('/')
          const outcome = "${{ steps.release.outcome }}"
          const version = "${{ steps.release.outputs.version }}"
          const gitTag = "${{ steps.release.outputs.gitTag }}"
          const releaseUrl = version ? "https://github.com/${{ github.repository }}/releases/tag/" + gitTag : undefined
          const runUrl = "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}"
          await github.checks.create({
            owner,
            repo,
            head_sha: "${{ needs.build.outputs.buildCommit || github.sha }}",
            name: version ? "release " + version : "release",
            conclusion: (outcome === 'success' && !version) ? "skipped" : outcome,
            details_url: releaseUrl || runUrl,
            output: {
              title: "release",
              summary: version
                ? `Released as [${version}](${releaseUrl})`
                : "Release skipped",
              text: `see ${runUrl}`,
            }
          })