dependabot_auto_merge.yaml

# -*- coding: utf-8 -*-
# Copyright (C) 2024 Benjamin Thomas Schwertfeger
# GitHub: https://github.com/btschwertfeger
#
# Workflow that approves and merges all pull requests from the dependabot[bot]
# author.
#
# Original source (May, 2024):
# - https://blog.somewhatabstract.com/2021/10/11/setting-up-dependabot-with-github-actions-to-approve-and-merge/

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: Harden Runner
        uses: step-security/harden-runner@0080882f6c36860b6ba35c610c98ce87d4e2f26f # v2.10.2
        with:
          disable-sudo: true
          egress-policy: block
          allowed-endpoints: >
            api.github.com:443
            github.com:443

      - name: Dependabot metadata
        id: dependabot-metadata
        uses: dependabot/fetch-metadata@dbb049abf0d677abbd7f7eee0375145b417fdd34 # v2.2.0
        with:
          github-token: "${{ secrets.GITHUB_TOKEN }}"

      - name: Approve a PR
        if: ${{ steps.dependabot-metadata.outputs.update-type != 'version-update:semver-major' }}
        run: gh pr review --approve "$PR_URL"
        env:
          PR_URL: ${{ github.event.pull_request.html_url }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Enable auto-merge for Dependabot PRs
        if: ${{ steps.dependabot-metadata.outputs.update-type != 'version-update:semver-major' }}
        run: gh pr merge --auto --squash "$PR_URL"
        env:
          PR_URL: ${{ github.event.pull_request.html_url }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}