add additionalProperties to gui api

Author: martingreilinger

container/src/main/java/io/vanillabp/cockpit/gui/api/v1/LoginApiController.java

@@ -215,8 +215,8 @@ public Mono<ResponseEntity<AppInformation>> appInformation(
                         .titleLong(properties.getTitleLong())
                         .titleShort(properties.getTitleShort())
                         .version(properties.getApplicationVersion())
-                        .buildTimestamp(properties.getBuildTimestamp())));
-        
+                        .buildTimestamp(properties.getBuildTimestamp())
+			.additionalProperties(properties.getAdditionalProperties())));
     }
 
     @Override

container/src/main/resources/api/gui/v1.yaml

@@ -66,6 +66,8 @@ components:
           type: string
         buildTimestamp:
           type: string
+        additionalProperties:
+          type: object
     Page:
       type: object
       required: