Add Uni/HS Mannheim

src/main/java/org/fachschaften/keycloak/form_extensions/SignupFormAction.java

@@ -62,6 +62,8 @@ public class SignupFormAction implements FormAction, FormActionFactory {
         "@upb.de",
         "@rub.de",
         "@ruhr-uni-bochum.de",
+        "@uni-mannheim.de",
+        "@hs-mannheim.de",
         // subdomains
         ".rwth-aachen.de",
         ".fsmpi.eu",
@@ -91,6 +93,8 @@ public class SignupFormAction implements FormAction, FormActionFactory {
         ".upb.de",
         ".rub.de",
         ".ruhr-uni-bochum.de",
+        ".uni-mannheim.de",
+        ".hs-mannheim.de",
     };
 
     @Override