re-enable cache

.forgejo/workflows/main.yml

@@ -4,6 +4,8 @@ on:
 jobs:
   web:
     runs-on: ubuntu-latest
+    env:
+      BUNDLE_GEMFILE: ${{ github.workspace }}/main/Gemfile
     steps:
       - name: Clone repository
         uses: actions/checkout@v4
@@ -12,8 +14,10 @@ jobs:
         uses: https://github.com/ruby/setup-ruby@v1
         with:
           ruby-version: 3.2.2
+          bundler-cache: true
+
       - name: Build
-        run: cd main && bundle && bundle exec jekyll build
+        run: cd main && bundle exec jekyll build
 
       - name: Deploy
         run: |