Check that rocketchat installs

src/freedombone-app-rocketchat

 
     rocketchat_create_database
 
+    cd "/etc/rocketchat" || exit 46327437
+    if ! npm install; then
+        exit 36483563
+    fi
+
     add_ddns_domain "$ROCKETCHAT_DOMAIN_NAME"
 
     ROCKETCHAT_ONION_HOSTNAME=$(add_onion_service rocketchat 80 "${ROCKETCHAT_ONION_PORT}")