code: func copy(src llb.State, srcPath string, dest llb.State, destPath string) llb.State {
  	cpImage := llb.Image("docker.io/library/alpine@sha256:1072e499f3f655a032e88542330cf75b02e7bdf673278f701d7ba61629ee3ebe")
  	cp := cpImage.Run(llb.Shlexf("cp -a /src%s /dest%s", srcPath, destPath))
  	cp.AddMount("/src", src, llb.Readonly)
  	return cp.AddMount("/dest", dest)
  }
docs: // copy copies files between 2 states using cp until there is no copyOp