Allows using `--debug` to enable debug logging under
any subcommand. Currently it needed to be set as
`docker --debug buildx` meaning only way to enable debug
in standalone mode was to set env variable instead and
updating existing commands to add `--debug` was cumbersome.
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
The previous definition was the same as the docker images prune command
and referenced dangling images, which isn't what the command does. This
commit brings the command description more inline with the buildctl
definition.
Additionally, add some more description of what the various flags do in
our reference pages.
Signed-off-by: Justin Chadwell <me@jedevc.com>
