workflow to create cf workers dev preview, comment on pull requests, and support multi-workers setup

workers-dev-preview.yml

---
name: workers dev preview

on:
  pull_request:
    types:
      - opened
      - synchronize
    paths:
        - 'src/**'
        - 'workers/**'
        - 'bun.lock'
        - '.github/workflows/workers-dev-preview.yml'

concurrency:
  group: ${{ github.workflow }}

permissions: {}

jobs:
  deploy-preview:
    name: ${{ matrix.worker }}
    if: github.event.pull_request.user.login != 'dependabot[bot]'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
    timeout-minutes: 5
    strategy:
      fail-fast: false
      matrix:
        worker: [worker-1, worker-2, worker-3] # add worker names
    steps:
      - name: checkout
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 #v4.2.2

      - name: setup bun
        uses: ./.github/actions/setup-bun
        with:
          gha-runner: true

      - name: build assets
        if: matrix.worker == 'app'
        run: bun build:prod

      - name: upload preview version
        id: upload-preview-version
        uses: cloudflare/wrangler-action@da0e0dfe58b7a431659754fdf3f186c529afbe65 #v3.14.1
        with:
          packageManager: bun
          apiToken: ${{ secrets.CF_API_TOKEN }}
          accountId: ${{ secrets.CF_ACCOUNT_ID }}
          command: |
            versions upload --tag ${{ github.event.number }} --env dev --cwd workers/${{ matrix.worker }}

      - name: find old comment
        id: find-comment
        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea #v7.0.1
        with:
          script: |
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            });

            const comment = comments.find((comment) => comment.body.includes('${{ matrix.worker }} preview url:'));

            return comment ? comment.id : false;

      - name: prepare comment body
        id: comment-body
        run: |
          {
            echo 'body<<EOF'
            echo "${{ matrix.worker }} preview url: [$preview_url]($preview_url)"
            echo EOF
          } >> $GITHUB_OUTPUT
        env:
          preview_url: ${{ steps.upload-preview-version.outputs.deployment-url }}

      - name: create comment
        if: ${{ steps.find-comment.outputs.result == 'false' }}
        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea #v7.0.1
        with:
          script: |
            github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: `${{ steps.comment-body.outputs.body }}`,
            });

      - name: update comment
        if: ${{ steps.find-comment.outputs.result != 'false' }}
        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea #v7.0.1
        with:
          script: |
            github.rest.issues.updateComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              comment_id: ${{ steps.find-comment.outputs.result }},
              body: `${{ steps.comment-body.outputs.body }}`,
            });