add hugo action

.github/workflows/firebase-hosting-merge.yml

@@ -10,6 +10,11 @@ jobs:
   build_and_deploy:
     runs-on: ubuntu-latest
     steps:
+      - uses: peaceiris/actions-hugo@v2
+        with:
+          hugo-version: 'latest'
+          extended: true
+
       - uses: actions/checkout@v4
       - run: cd hugo && hugo --minify
       - uses: FirebaseExtended/action-hosting-deploy@v0