ci: add dependabot reviewer

.github/workflows/dependabot-reviewer.yml

@@ -0,0 +1,39 @@
+name: Dependabot Reviewer
+
+on: pull_request_target
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  review-dependabot-pr:
+    name: Approve PR
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    env:
+      PR_URL: ${{ github.event.pull_request.html_url }}
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - name: Fetch Dependabot metadata
+        id: dependabot-metadata
+        uses: dependabot/fetch-metadata@v1.6.0
+
+      - name: Enable auto-merge for Dependabot PRs
+        run: gh pr merge --auto --squash "$PR_URL"
+
+      - name: Approve patch and minor updates
+        if: ${{ steps.dependabot-metadata.outputs.update-type == 'version-update:semver-patch'|| steps.dependabot-metadata.outputs.update-type == 'version-update:semver-minor'}}
+        run: |
+          gh pr review "$PR_URL" --approve --body "I'm **approving** this pull request because **it only includes patch or minor updates**."
+
+      - name: Approve major updates of dev dependencies
+        if: ${{ steps.dependabot-metadata.outputs.update-type == 'version-update:semver-major' && steps.dependabot-metadata.outputs.dependency-type == 'direct:development'}}
+        run: |
+          gh pr review "$PR_URL" --approve --body "I'm **approving** this pull request because **it only includes major updates of dev dependencies**."
+
+      - name: Comment on major updates of normal dependencies
+        if: ${{ steps.dependabot-metadata.outputs.update-type == 'version-update:semver-major' && steps.dependabot-metadata.outputs.dependency-type == 'direct:production'}}
+        run: |
+          gh pr comment "$PR_URL" --body "I'm **not approving** this PR because **it includes major updates of normal dependencies**."
+          gh pr edit "$PR_URL" --add-label "requires-manual-qa"