Include realm-id as env variable

Author: LEDfan

src/main/java/eu/openanalytics/containerproxy/model/runtime/runtimevalues/RealmIdKey.java

@@ -27,7 +27,7 @@ private RealmIdKey() {
                 "SHINYPROXY_REALM_ID",
                 false,
                 true,
-                false,
+                true,
                 false, String.class);
     }