Merge pull request dragonflyoss#1095 from jiangliu/v2.1-compat

rafs: reserve bits in RafsSuperFlags to be compatible with v2.2

Merge pull request dragonflyoss#1083 from imeoer/nydusify-fix-prefetch

nydusify: upgrade deps to fix lost prefetch table

Merge pull request dragonflyoss#1016 from imeoer/fix-release-pipeline

release: fix pipeline hang when compile for amd64

Merge pull request dragonflyoss#1017 from jiangliu/v6-underflow-2.1

rafs: fix a underflow bug in rafs v6 implementation

Merge pull request dragonflyoss#940 from changweige/2.1-fix-graceful-…

…exit

nydusd: register signal hanlder earlier

Merge pull request dragonflyoss#839 from imeoer/stable/v2.1-cherry-pick

[backport to stable/v2.1] storage: add mirror health checking support

Merge pull request dragonflyoss#804 from imeoer/bring-auto-version

release: update version on build automatically

Merge pull request dragonflyoss#789 from changweige/port-2.1-enlarge-…

…fuse-threads-num

nydusd: enlarge default fuse server threads

Merge pull request dragonflyoss#733 from imeoer/prepare-v2.1.0-rc.3.1…

…-release

release: prepare for v2.1.0-rc.3.1

Merge pull request dragonflyoss#730 from imeoer/revert-make-release

Revert "makefile: fix a minor bug in Makefile"