Adding post installation check (#396)

Author: mattamon

.github/workflows/pimcore-demo.yml

@@ -89,3 +89,14 @@ jobs:
         -e PIMCORE_INSTALL_MYSQL_PASSWORD=pimcore \
         -- \
         php vendor/bin/pimcore-install -n --mysql-host-socket=db --mysql-database=pimcore
+          
+        # Change owner  
+        sudo chown -R www-data .  
+        
+        # Check if website is reachable
+        response=$(docker-compose exec -T -- php bash -c 'curl -s "nginx:80"')
+        
+        if [[ ! $response =~ "Satisfaction" ]]; then
+           echo "Install failed, skipping build"
+           exit 1;
+        fi