ignore venv, and ensure always sort group members to fix flaky test in postgres (#1357)

Co-authored-by: burnettk <burnettk@users.noreply.github.com>

spiffworkflow-backend/.gitignore

@@ -23,3 +23,4 @@ node_modules
 /some_cache_dir
 /process.json
 /spiffworkflow_backend.svg
+/.venv

spiffworkflow-backend/src/spiffworkflow_backend/scripts/get_group_members.py

@@ -26,5 +26,5 @@ class GetGroupMembers(Script):
         if group is None:
             raise GroupNotFoundError(f"Script 'get_group_members' could not find group with identifier '{group_identifier}'.")
 
-        usernames = [u.username for u in group.users]
+        usernames = sorted([u.username for u in group.users])
         return usernames