approve_and_merge.yml

name: "Auto approve Pull Requests and enable auto-merge"
on:
  pull_request_target
jobs:
  worker:
    runs-on: ubuntu-latest
    if: github.actor == 'dependabot[bot]'
    steps:
      - name: automerge
        uses: actions/github-script@v4.0.2
        with:
          github-token: "${{ secrets.GH_TOKEN }}"
          script: |
            await github.pulls.createReview({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number,
              event: 'APPROVE'
            })

            const res = await github.graphql(`query {
              repository(owner: "${context.repo.owner}", name: "${context.repo.repo}") {
                pullRequest(number: ${context.issue.number}) {
                  id
                }
              }
            }`)

            await github.graphql(`mutation {
              enablePullRequestAutoMerge(input: { pullRequestId: "${res.repository.pullRequest.id}", mergeMethod: SQUASH }) {
                clientMutationId
              }
            }`)