buildx

Author	SHA1	Message	Date
Brian Goff	b2ec1d331c	Add builder as a global flag. 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>	6 years ago
Brian Goff	213d3af3b0	Add option to build/bake to override instance This helps prevent race conditions with concurrent build invocations. Signed-off-by: Brian Goff <cpuguy83@gmail.com>	6 years ago
Tonis Tiigi	d52f5db6ba	commands: add du command Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>	6 years ago
Tonis Tiigi	66672b4052	commands: add prune command Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>	6 years ago