WIP: Append github to backend allowed repositories

* [ ] Allow creation of repository from github.com
* [ ] Update tests

Author: vrigal

backend/code_review_backend/app/settings.py

@@ -212,7 +212,7 @@
 PHABRICATOR_HOST = "https://phabricator.services.mozilla.com"
 
 # Limit the automatic creation of reositories to allowed hosts
-ALLOWED_REPOSITORY_HOSTS = ["hg.mozilla.org"]
+ALLOWED_REPOSITORY_HOSTS = ["hg.mozilla.org", "github.com"]
 
 DYNO = env("DYNO")
 # Heroku settings override to run the web app through dyno

backend/code_review_backend/issues/serializers.py

@@ -35,7 +35,7 @@ class RepositoryGetOrCreateField(serializers.SlugRelatedField):
     )
     default_error_messages = {
         **serializers.SlugRelatedField.default_error_messages,
-        "invalid_url": "Repository URL must match hg.mozilla.org.",
+        "invalid_url": "Base repository URL is not allowed.",
     }
     queryset = Repository.objects.all()