build-using-dockerfile example

The build-using-dockerfile CLI is just provided as an example for writing a BuildKit client application.

For people familiar with docker build command, build-using-dockerfile is provided as an example for building Dockerfiles with BuildKit using a syntax similar to docker build.

go get .

build-using-dockerfile -t myimage /path/to/dir

# build-using-dockerfile will automatically load the resulting image to Docker
docker inspect myimage