fix: lowercase repository owner in tag

Author: 1fabi0

.github/workflows/docker.yml

@@ -30,7 +30,7 @@ jobs:
         uses: docker/build-push-action@v7
         with:
           context: .
-          tags: ghcr.io/${{ github.repository }}:latest
+          tags: ghcr.io/${{ github.repository_owner }}/skynet:latest
           push: true
           build-args: |
             BUILD_WITH_VLLM=0