Fix GitHub Actions Docker push permissions

- Use github.repository_owner instead of github.actor for authentication
- Explicitly set IMAGE_NAME to ensure lowercase repository name
- Resolves 403 Forbidden error when pushing to GHCR

.github/workflows/docker-publish.yml

@@ -12,7 +12,7 @@ on:
 
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}
+  IMAGE_NAME: ${{ github.repository_owner }}/monitor
 
 jobs:
   build:
@@ -35,7 +35,7 @@ jobs:
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
+          username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Extract metadata