buildah push and from now use the credentials stored in ${XDG_RUNTIME_DIR}/containers/auth.json by kpod login
if the auth file path is changed, buildah push and from can get the credentials from the custom auth file
using the --authfile flag
e.g buildah push --authfile /tmp/auths/myauths.json alpine docker://username/image
Signed-off-by: Urvashi Mohnani <umohnani@redhat.com>
Closes: #325
Approved by: rhatdan