fix: set namespace for the template instead of using the repo name

.github/workflows/release.yaml

@@ -21,6 +21,7 @@ jobs:
       - name: "Publish"
         uses: devcontainers/action@v1
         with:
+          templates-namespace: "devcontainer"
           publish-templates: "true"
           base-path-to-templates: "./src"
         env: