Add hugo module caching

.forgejo/workflows/ci.yml

@@ -5,6 +5,8 @@ name: Homepage deployment
 jobs:
   deploy:
     runs-on: ubuntu-latest
+    env:
+      HUGO_CACHEDIR: /tmp/hugo_cache
     steps:
       - name: Setup Go
         uses: actions/setup-go@v5
@@ -14,6 +16,13 @@ jobs:
         run: wget https://dl.min.io/client/mc/release/linux-amd64/mc && chmod +x mc && cp mc /usr/local/bin
       - name: Clone repository
         uses: actions/checkout@v4
+      - name: Cache Hugo modules
+        uses: actions/cache@v4
+        with:
+          path: ${{ env.HUGO_CACHEDIR }}
+          key: ${{ runner.os }}-hugomod-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-hugomod-
       - name: Setup Hugo
         uses: https://github.com/peaceiris/actions-hugo@v3
         with: