ci: Add dependabot_auto_merge.yaml

.github/workflows/dependabot_auto_merge.yaml

@@ -0,0 +1,34 @@
+# SPDX-FileCopyrightText: 2024 Shun Sakai
+#
+# SPDX-License-Identifier: Apache-2.0 OR MIT
+
+name: Dependabot auto-merge
+
+on: pull_request_target
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  dependabot:
+    name: Dependabot auto-merge
+    if: github.actor == 'dependabot[bot]' && github.repository_owner == 'sorairolake'
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v2.2.0
+        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: ${{ steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor' }}
+        run: gh pr merge --auto --squash "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}