This commit attemts to support containerd on darwin platform. With an
external runtime shim, ctr run should work with, for instance,
--runtime=io.containerd.runu.v1. An example of runtime and shim is
managed under different repository (github.com/ukontainer/runu/).
Signed-off-by: Hajime Tazaki <thehajime@gmail.com>
Remove build tags which are already implied by the name of the file.
Ensures build tags are used consistently
Signed-off-by: Derek McGowan <derek@mcg.dev>