This allows all subcommands to use this flag. Additionally reads the default value for the flag from the `BUILDX_BUILDER` env var. Precedence is: CLI ARG > flag > env var > config file Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This helps prevent race conditions with concurrent build invocations. Signed-off-by: Brian Goff <cpuguy83@gmail.com>
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>