Added isOfficial

public/v2/apps/discourse.json

@@ -3,6 +3,7 @@
     "documentation": "Taken from https://hub.docker.com/r/bitnami/discourse",
     "displayName": "Discourse",
     "description": "Discourse is the 100% open source discussion platform built for the next decade of the Internet. Use it as a mailing list, discussion forum, long-form chat room, and more!",
+    "isOfficial": true,
     "dockerCompose": {
         "version": "2",
         "services": {