ci: fix release.yml (#253)

Author: nakamasato

.github/workflows/release.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Build and push Docker image
         uses: docker/build-push-action@v4
         with:
-          context: k8s-ci
+          context: .
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}