💚 Dependabot の自動マージワークフローを追加

.github/workflows/dependabot-auto-merge.yml

@@ -0,0 +1,39 @@
+name: "Dependabot Auto Merge"
+
+on:
+  pull_request: ~
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-22.04
+    if: github.actor == 'dependabot[bot]'
+    steps:
+      # https://github.com/marketplace/actions/create-github-app-token
+      - name: Create GitHub App Token
+        uses: actions/[email protected]
+        id: app-token
+        with:
+          app-id: ${{ vars.BOT_APP_ID }}
+          private-key: ${{ secrets.BOT_PRIVATE_KEY }}
+
+      # https://github.com/marketplace/actions/fetch-metadata-from-dependabot-prs
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/[email protected]
+        with:
+          github-token: "${{ steps.app-token.outputs.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 review --approve "$PR_URL"
+          gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ steps.app-token.outputs.token }}