code: func WithExternalBuildContext(ctx *fakecontext.Fake) func(*icmd.Cmd) func() {
  	return func(cmd *icmd.Cmd) func() {
  		cmd.Dir = ctx.Dir
  		cmd.Command = append(cmd.Command, ".")
  		return nil
  	}
  }
docs: // WithExternalBuildContext use the specified context as build context