only write config file when contents have changed (memo)

csharp/App/SaliMax/src/SystemConfig/Config.cs

@@ -38,7 +38,7 @@ public class Config //TODO: let IE choose from config files (Json) and connect t
     public required DeviceConfig Devices                        { get; set; }
     public required S3Config?    S3                             { get; set; }
 
-    
+    private static String? LastSavedData { get; set; }
     
     #if DEBUG 
     public static Config Default => new()
@@ -121,6 +121,12 @@ public class Config //TODO: let IE choose from config files (Json) and connect t
         try
         {
             var jsonString = Serialize(this, JsonOptions);
+
+            if (LastSavedData == jsonString)
+                return;
+            
+            LastSavedData = jsonString;
+
             File.WriteAllText(configFilePath, jsonString);
         }
         catch (Exception e)