fix repo index url

Author: fty4

.github/workflows/release.yaml

@@ -38,7 +38,7 @@ jobs:
           rm -rf ./repo/helm-gh-pages/
           cp ./release/*tgz ./repo/${REPO_NAME}/
           cp ./README.md ./repo/${REPO_NAME}/index.md
-          helm repo index --merge ./repo/index.yaml --url ${HELM_URL}/${REPO_NAME} ./repo
+          helm repo index --merge ./repo/index.yaml --url ${HELM_URL} ./repo
 
       - name: Deploy
         uses: JamesIves/github-pages-deploy-action@v4.2.5