Merge pull request #761 from imeoer/add-release-mirror-url

release: add npm mirror url into release note

Author: jiangliu

.github/workflows/release.yml

@@ -204,6 +204,8 @@ jobs:
       uses: softprops/action-gh-release@v1
       with:
         name: "Nydus Image Service ${{ env.tag }}"
+        body: |
+          Mirror (update in 10 min): https://registry.npmmirror.com/binary.html?path=nydus/${{ env.tag }}/
         generate_release_notes: true
         files: |
           ${{ env.tarballs }}