buildx/store
Ilya Dmitrichenko 4b2aab09b5
Allow users to have separate store paths
- decouple store path from `$DOCKER_CONFIG`
- improve containerised build setup
- introduce new `$BUILDX_CONFIG` environment variable

Signed-off-by: Ilya Dmitrichenko <errordeveloper@gmail.com>
..
nodegroup.go kubernetes: show Kubernetes Pods as buildx "Nodes" in `docker buildx inspect`
nodegroup_test.go driver: allow setting driver opts
store.go Allow users to have separate store paths
store_test.go store: add implementation
util.go commands: add implementations for create, use, rm, stop