Merge pull request #3037 from crazy-max/0.21_picks_0.21.2

[v0.21] cherry-picks for v0.21.2

Merge pull request #3018 from crazy-max/0.21_picks_0.21.1

[v0.21] cherry-picks for v0.21.1

Merge pull request #3011 from jsternberg/v0.21.0-picks

[v0.21] cherry-picks for v0.21.0

Merge pull request #3004 from crazy-max/0.21_picks_0.21.0-rc3

[v0.21] cherry-picks 0.21.0-rc3

Merge pull request #2993 from tonistiigi/update-buildkit-v0.20.0-rc2

vendor: update buildkit to v0.20.0-rc2

Merge pull request #2983 from tonistiigi/update-buildkit-v0.20.0-rc1

vendor: update buildkit to v0.20.0-rc1

Merge pull request #2945 from tonistiigi/v0.20.1-cherry-picks

[v0.20.1] cherry picks

Merge pull request #2933 from crazy-max/v0.20_backport_buildkit-0.19.0

[v0.20 backport] vendor: update buildkit to v0.19.0

Merge pull request #2928 from tonistiigi/update-buildkit-v0.19.0-rc3

vendor: update buildkit to v0.19.0-rc3

Merge pull request #2891 from tonistiigi/history-command-initial

Add buildx history command