Fix nginx read-only filesystem issues

CloudronManifest.json

@@ -10,7 +10,6 @@
   "manifestVersion": 2,
   "website": "https://www.keila.io",
   "contactEmail": "hello@keila.io",
-  "icon": "file://icon.png",
   "tags": [
     "email",
     "newsletter",
@@ -26,12 +25,5 @@
   "minBoxVersion": "7.0.0",
   "postInstallMessage": "file://POSTINSTALL.md",
   "changelog": "file://CHANGELOG",
-  "optionalSso": false,
-  "tcpPorts": {
-    "KEILA_PORT": {
-      "title": "Keila HTTP Port",
-      "description": "Keila HTTP Port",
-      "containerPort": 4000
-    }
-  }
+  "optionalSso": false
 }