deploy-pr.yml

on:
  workflow_call:
    inputs:
      deploy_target:
        description: 'Deploy target'
        required: true
        type: string
        default: 'production'
    secrets:
      GH_TOKEN:
        required: true

jobs:
  create-and-merge-deploy-pr:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - name: "trigger deploy trial when diff exists and status check passed"
        env:
          GH_TOKEN: ${{ secrets.GH_TOKEN }}
          DEPLOY_TARGET: ${{ inputs.deploy_target }}
        run: |
          # Check out branches so that you don't have to speculate the remote name.
          git checkout main
          git checkout ${DEPLOY_TARGET}
          does_diff_exist=$( \
            git diff --quiet --exit-code \
                ${DEPLOY_TARGET} main ; \
            echo $? )
          if [[ "${does_diff_exist}" == "0" ]]; then
            echo "'main' and '${DEPLOY_TARGET}' are identical. Quit the job."
            exit 0
          elif [[ "${does_diff_exist}" != "1" ]]; then
            echo 'git diff failed unexpectedly.'
            exit 1
          fi
          
          # Add some logic to check if the latest CI status is success.
          
          # Create a PR
          pr_url=$( \
            gh pr create \
              --base ${DEPLOY_TARGET} \
              --head main --label "auto deploy" \
              --title "Deploy to ${DEPLOY_TARGET}" \
              --body "Auto deploy" \
              --no-maintainer-edit )
          echo "Created a PR: ${pr_url}"
          if [[ -z "${pr_url}" ]]; then
            echo "Failed to create PR unexpectedly."
            exit 1
          fi
          # And finally, merge it!
          # NOTE: use `--admin` to bypass the review requirement.
          gh pr merge ${pr_url} --admin --merge

manual-deploy.yml

name: Manual Deploy

on:
  # Manual trigger from the "Actions" tab on the GitHub UI.
  workflow_dispatch:
    inputs:
      deploy_target:
        description: 'Deploy target'
        required: true
        default: 'production'
        type: choice
        options:
          - production
          - any-other-deploy-target-branches

jobs:
  deploy:
    uses: ./.github/workflows/deploy-pr.yml
    with:
      deploy_target: ${{ github.event.inputs.deploy_target }}
    secrets:
      GH_TOKEN: ${{ secrets.GH_TOKEN_YOUR_BOT }}