dependabot-retarget-to-develop.yml

name: Retarget Dependabot PRs to develop

on:
  pull_request_target:
    types: [opened, reopened, synchronize, ready_for_review]

permissions:
  pull-requests: write

jobs:
  retarget:
    if: >
      github.actor == 'dependabot[bot]' &&
      github.event.pull_request.base.ref == 'main' &&
      github.event.pull_request.state == 'open'
    runs-on: ubuntu-latest
    steps:
      - name: Change base branch to develop
        uses: actions/github-script@v9
        with:
          script: |
            const pr = context.payload.pull_request;

            // Only retarget if it is still targeting main
            if (pr.base.ref !== 'main') {
              core.info(`PR base is already '${pr.base.ref}', nothing to do.`);
              return;
            }

            core.info(`Retargeting PR #${pr.number} from '${pr.base.ref}' to 'develop'...`);

            await github.rest.pulls.update({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: pr.number,
              base: 'develop',
            });

            core.info(`Done. PR #${pr.number} now targets 'develop'.`);