Don't overwrite all settings during upgrade

conf/config.json

@@ -1,10 +1,5 @@
 {
   "system": {
-    "datadirectory": "#DATADIR#",
-    "trusted_domains": [
-      "localhost",
-      "#DOMAIN#"
-    ],
     "updatechecker": false,
     "memcache.local": "\\OC\\Memcache\\APCu",
     "integrity.check.disabled": true,

conf/config_install.json

@@ -0,0 +1,9 @@
+{
+  "system": {
+    "datadirectory": "#DATADIR#",
+    "trusted_domains": [
+      "localhost",
+      "#DOMAIN#"
+    ]
+  }
+}

scripts/install

@@ -144,11 +144,6 @@ exec_occ maintenance:install \
 # CONFIGURE NEXTCLOUD
 #=================================================
 
-nc_conf="${final_path}/config.json"
-cp ../conf/config.json "$nc_conf"
-ynh_replace_string "#DOMAIN#" "$domain" "$nc_conf"
-ynh_replace_string "#DATADIR#" "$datadir" "$nc_conf"
-
 # Ensure that UpdateNotification app is disabled
 exec_occ app:disable updatenotification
 
@@ -156,7 +151,18 @@ exec_occ app:disable updatenotification
 exec_occ app:enable user_ldap
 exec_occ ldap:create-empty-config
 
-# Load the config file in nextcloud
+# Load the installation config file in nextcloud
+nc_conf="${final_path}/config_install.json"
+cp ../conf/config_install.json "$nc_conf"
+ynh_replace_string "#DOMAIN#" "$domain" "$nc_conf"
+ynh_replace_string "#DATADIR#" "$datadir" "$nc_conf"
+exec_occ config:import "$nc_conf"
+# Then remove it
+rm -f "$nc_conf"
+
+# Load the additional config file (used also for upgrade)
+nc_conf="${final_path}/config_install.json"
+cp ../conf/config.json "$nc_conf"
 exec_occ config:import "$nc_conf"
 # Then remove it
 rm -f "$nc_conf"