Signed-off-by: Jonathan Giannuzzi <jonathan@giannuzzi.me>

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

Add BUILDKIT_SANDBOX_HOSTNAME build-arg

Currently, eStargz compression doesn't preserve the original tar metadata
(header bytes and their order). This causes failure of `TestGetRemote` because
an uncompressed blob converted from a gzip blob provides different digset
against the one converted from eStargz blob even if their original tar (computed
by differ) are the same.
This commit solves this issue by fixing eStargz to preserve original tar's
metadata that is modified by eStargz.

Signed-off-by: Kohei Tokunaga <ktokunaga.mail@gmail.com>

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

Fix estargz compression loses the original tar metadata

Fix flakiness during import of a cache with empty layers removed

Enhance ANSI colors for progress ui

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

Move resolver config to a dedicated package