fix(ci): lowercase GHCR owner name to fix 'repository name must be lowercase' error

`github.repository_owner` returns 'MythEclipse' (mixed case) which GHCR rejects.
Hardcode lowercase 'mytheclipse' to match GHCR requirements.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/deploy-docker.yml

@@ -12,7 +12,8 @@ permissions:
 
 env:
   REGISTRY: ghcr.io
-  OWNER: ${{ github.repository_owner }}
+  OWNER: mytheclipse
+
 
 jobs:
   build-and-push: