Update release.yaml (#81)

Author: monotek

.github/workflows/release.yaml

@@ -32,7 +32,7 @@ jobs:
         uses: docker/metadata-action@v5
         with:
           images: |
-            ghcr.io/kokuwaio/gcloud-mysql
+            ghcr.io/${{ github.repository_owner }}/gcloud-mysql
           tags: |
             type=ref,event=branch
             type=ref,event=tag