Use correct GitHub source for galaxy import

The arguments to ansible-galaxy role import are <github_user> <github_repo>
(the clone source), not the Galaxy namespace. The repository lives under
the peering-manager organization.

Author: gmazoyer

.github/workflows/ci.yml

@@ -80,4 +80,4 @@ jobs:
         run: >-
           ansible-galaxy role import
           --token ${{ secrets.GALAXY_API_KEY }}
-          gmazoyer ansible-role-peering-manager
+          peering-manager ansible-role-peering-manager