build: support for saving local state by build ref

Signed-off-by: CrazyMax <[email protected]>
Signed-off-by: Tonis Tiigi <[email protected]>

build: filepath to slash for localstate

Signed-off-by: CrazyMax <[email protected]>

builder: error when bootstrap failed for all nodes

Signed-off-by: CrazyMax <[email protected]>

builder: error when bootstrap failed with a single node

Signed-off-by: CrazyMax <[email protected]>

local state

Signed-off-by: CrazyMax <[email protected]>

local state

Signed-off-by: CrazyMax <[email protected]>

Merge pull request docker#1042 from tonistiigi/update-buildkit-220403…

…-v0.8

[v0.8] vendor: update buildkit to 10e6f94b

Merge pull request docker#1018 from tonistiigi/v0.8-compose-target-dot

[v0.8] bake: allow dot in target names for compose

Merge pull request docker#993 from tonistiigi/update-buildkit-220308

vendor: update buildkit

Merge pull request docker#969 from tonistiigi/update-buildkit-20220225

vendor: update buildkit to 0692ad79