dependabot.yml

# NOTE: This workflow expects that branch protection rules require all checks to pass before merging.
# Auto-merge will only occur if all required status checks and reviews are successful.
#
# NOTE: pull_request_target is used instead of pull_request so that GITHUB_TOKEN has write
# permissions (needed for gh pr review / gh pr merge). Workflows triggered by pull_request from
# Dependabot run with a read-only token and cannot approve or merge PRs.
#
# SECURITY: pull_request_target runs workflow code from the BASE branch (master), not the PR branch,
# so a malicious PR cannot inject code that runs with the write token. This is safe here because:
#   - No actions/checkout step exists — PR code is never executed.
#   - The job is guarded by `if: github.event.pull_request.user.login == 'dependabot[bot]'`.
# WARNING: Never add actions/checkout (especially with the PR head ref) to this workflow — doing so
# would create an RCE vector where untrusted code runs with a write-capable token.

name: Dependabot auto-approve and auto-merge
on:
  pull_request_target:
    types: [opened, synchronize]

permissions:
  contents: write
  pull-requests: write

jobs:
  dependabot:
    name: Auto-approve and auto-merge Dependabot PRs
    runs-on: ubuntu-latest
    if: github.event.pull_request.user.login == 'dependabot[bot]' && github.repository == 'AbsaOSS/generate-release-notes'
    steps:
      - name: Dependabot metadata
        id: metadata
        uses: dependabot/fetch-metadata@25dd0e34f4fe68f24cc83900b1fe3fe149efef98
        with:
          github-token: "${{ secrets.GITHUB_TOKEN }}"
      - name: Approve a PR
        run: gh pr review --approve "$PR_URL"
        env:
          PR_URL: ${{ github.event.pull_request.html_url }}
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      - name: Enable auto-merge for Dependabot PRs
        if: startsWith(steps.metadata.outputs.update-type, 'version-update') || startsWith(steps.metadata.outputs.update-type, 'security')
        run: gh pr merge --auto --squash "$PR_URL"
        continue-on-error: true
        env:
          PR_URL: ${{ github.event.pull_request.html_url }}
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}