This release enables to optionallly create smaller eStargz images using the following flags for ctr-rmeote i convert or ctr-remote i optimize (#956).

• --estargz-external-toc: Separates TOC JSON into another image (called "TOC image"). The result eStargz doesn't contain TOC so we can expect a smaller size than normal eStargz (refer to /docs/estargz.md for the related eStargz spec).
• --estargz-min-chunk-size: Specifies the minimal number of bytes of data must be written in one gzip stream. If it's > 0, multiple files and chunks can be written into one gzip stream. Smaller number of gzip header and smaller size of the result blob can be expected (refer to /docs/estargz.md for the related eStargz spec).

Please refer to /docs/smaller-estargz.md for more details about the usage.

Notable Changes

• eStargz
  • Support creating smaller eStargz images (--estargz-external-toc and --estargz-min-chunk-size) (#956)
• stargz-snapshotter
  • fs: Try unmount without MNT_FORCE before force unmount (#978)
  • remote: Support per-registry request headers (#983)
  • Allow using fusermount3 (#970)
• converter
  • zstdchunked: allows specifying compression level (#984)
• Kind image (ghcr.io/containerd/stargz-snapshotter:${VERSION}-kind)
  • Revert clone3-workaround (#967)
• CI
  • Bump nerdctl to 1.0.0 (#969), thanks to @jenting
• Documents
  • Add document about integrations of eStargz with other tools (/docs/integration.md) (#995, #997), thanks to @gaius-qi