Install and enable NC calendar app

Closes: #905

flux2/apps/nextcloud/release.yaml

@@ -117,6 +117,14 @@ spec:
         rootUser:
           password: "${nextcloud_mariadb_root_password}"
 
+    apps:
+      - name: sociallogin
+        enabled: true
+      - name: onlyoffice
+        enabled: true
+      - name: calendar
+        enabled: true
+
     setupApps:
       backoffLimit: 20