revert: go back to lemonarc build

.github/workflows/deploy.yml

@@ -1,9 +1,8 @@
 name: DEPLOY
-
 on:
   push:
     branches:
-      - main
+    - main
 
 jobs:
   deploy:
@@ -13,33 +12,22 @@ jobs:
       matrix:
         target: [webfrontend03, webfrontend04, webfrontend05, webfrontend06]
     runs-on: ubuntu-latest
-
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Set up Ruby environment
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: '3.2'
-          bundler-cache: true # Enables caching for Bundler
-
-      - name: Install dependencies
-        run: bundle install --jobs 4 --retry 3
-
-      - name: Build Jekyll site
-        run: bundle exec jekyll build
-
-      - name: Verify _site directory
-        run: ls -al ${{ github.workspace }}/_site
-
-      - name: Deploy via rsync
-        uses: burnett01/rsync-deployments@5.2
-        with:
-          switches: -avzr --delete
-          path: ${{ github.workspace }}/_site/
-          remote_path: /srv/www/ffmuc.net/
-          remote_host: ${{ matrix.target }}.ext.ffmuc.net
-          remote_user: deploy-ffmuc
-          rsh: -o HostKeyAlgorithms=+ssh-rsa -o PubkeyAcceptedKeyTypes=+ssh-rsa
-          remote_key: ${{ secrets.DEPLOY_KEY }}
+    - uses: actions/checkout@v4
+      # Use GitHub Actions' cache to shorten build times and decrease load on servers
+    - uses: actions/cache@v4.2.0
+      with:
+        path: vendor/bundle
+        key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-gems-
+    - uses:  lemonarc/jekyll-action@1.0.0
+    - name: rsync deployments
+      uses: burnett01/rsync-deployments@5.2
+      with:
+        switches: -avzr --delete
+        path: _site
+        remote_path: /srv/www/ffmuc.net/
+        remote_host: ${{ matrix.target }}.ext.ffmuc.net
+        remote_user: deploy-ffmuc
+        remote_key: ${{ secrets.DEPLOY_KEY }}