verify-pr-base-branch.yml

name: verify-pr-base-branch

on:
  pull_request:

jobs:
  verify-pr-base-branch:
    name: verify-pr-base-branch
    runs-on: ubuntu-latest
    steps:
      - name: Get base branch
        id: get-pr-base-branch
        uses: actions/github-script@v3
        with:
          script: |
            const pr = await github.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number,
            });
            return pr.data.base.ref;
          result-encoding: string

      - name: Update PR if wrong base branch
        if: ${{ steps.get-pr-base-branch.outputs.result != 'develop' }}
        uses: actions/github-script@v3
        with:
          github-token: ${{secrets.GITHUB_TOKEN}}
          script: |
            await github.pulls.update({
              pull_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              base: 'develop',
            });
            await github.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: "Thanks for opening this pull request! 🙏<br><br>I've changed this PR's base branch to `develop`. A maintainer will review your PR soon!",
            });