REFACTOR(auth): use CR_PAT for ghcr.io

- Use CR_PAT instead of GITHUB_TOKEN for registry login
- Fix authentication for private container registry

.github/workflows/build.yml

@@ -34,7 +34,7 @@ jobs:
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          password: ${{ secrets.CR_PAT }}
 
       - name: Lowercase repository name
         id: lowercase