dependabot_automerge.yml

name: Dependabot auto-merge
on: pull_request_target

permissions:
  pull-requests: write
  contents: write

jobs:
  dependabot:
    runs-on: ubuntu-latest
    if: ${{ github.actor == 'dependabot[bot]' }}
    steps:
      - name: Dependabot metadata
        id: metadata
        uses: dependabot/fetch-metadata@v1.1.1
        with:
          github-token: "${{ secrets.GITHUB_TOKEN }}"
      - name: Enable auto-merge for Dependabot PRs
        if: ${{ steps.metadata.outputs.update-type != 'version-update:semver-major' }}
        uses: actions/github-script@v5
        with:
          github-token: "${{ secrets.GITHUB_TOKEN }}"
          script: |
            const getPullRequestIdQuery = `query GetPullRequestId($owner: String!, $repo: String!, $pullRequestNumber: Int!) {
              repository(owner: $owner, name: $repo) {
                pullRequest(number: $pullRequestNumber) {
                  id
                }
              }
            }`
            const repoInfo = {
              owner: context.repo.owner,
              repo: context.repo.repo,
              pullRequestNumber: context.issue.number,
            }
            const response = await github.graphql(getPullRequestIdQuery, repoInfo)

            await github.rest.pulls.createReview({
              pull_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              event: 'APPROVE',
            })

            const enableAutoMergeQuery = `mutation ($pullRequestId: ID!, $mergeMethod: PullRequestMergeMethod!) {
              enablePullRequestAutoMerge(input: {
                pullRequestId: $pullRequestId,
                mergeMethod: $mergeMethod
              }) {
                pullRequest {
                  autoMergeRequest {
                    enabledAt
                    enabledBy {
                      login
                    }
                  }
                }
              }
            }`
            const data = {
              pullRequestId: response.repository.pullRequest.id,
              mergeMethod: 'MERGE',
            }

            await github.graphql(enableAutoMergeQuery, data)