Ref #36652: fix upload after spring update

Author: LEDfan

src/main/java/eu/openanalytics/containerproxy/ContainerProxyApplication.java

@@ -158,6 +158,7 @@ public static Properties getDefaultProperties() {
         // disable multi-part handling by Spring. We don't need this anywhere in the application.
         // When enabled this will cause problems when proxying file-uploads to the shiny apps.
         properties.put("spring.servlet.multipart.enabled", "false");
+        properties.put("server.undertow.max-http-post-size", "-1");
 
         // disable logging of requests, since this reads part of the requests and therefore undertow is unable to correctly handle those requests
         properties.put("logging.level.org.springframework.web.servlet.DispatcherServlet", "INFO");