Nydus Image Service v2.1.6

Binaries download mirror (sync within a few hours): https://registry.npmmirror.com/binary.html?path=nydus/v2.1.6/

What's Changed

• Backports two bugfixes from master into stable/v2.1 by @jiangliu in #1216
• [backport] action: fix smoke test for branch pattern by @imeoer in #1236
• action: fix checkout on pull_request_target by @imeoer in #1252
• [backport] nydusify: fix overlayfs mount options for check by @imeoer in #1253
• storage: refine the way to implement BlobIoChunk by @jiangliu in #1211

Full Changelog: v2.1.5...v2.1.6