Gitea CI: log in to the registry with ACTION_PAT

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.gitea/workflows/ci.yaml

@@ -52,7 +52,7 @@ jobs:
         with:
           registry: git.shx.one
           username: ${{ gitea.actor }}
-          password: ${{ secrets.ACTIONS_PAT }}
+          password: ${{ secrets.ACTION_PAT || secrets.ACTIONS_PAT }}
 
       # Registry names are lowercase.
       - name: Resolve image name