Add workflow to test building site

Author: marcprux

.github/workflows/ci.yml

@@ -15,8 +15,8 @@ jobs:
         with:
           path: appland
 
-      #- name: Copy sample data into project root
-        #run: cp -a appland/samples/* .
+      - name: Copy sample data into project root
+        run: cp -a appland/samples/* .
 
       - name: Build with Astro
         uses: withastro/action@v6