added gitlab-mirroring job

1 job for master in 13 seconds (queued for 1 second)
Name Stage Failure
failed
github_mirror Mirror There is an unknown failure, please try again
BusyBox v1.27.2 (2017-11-28 16:17:30 GMT) multi-call binary.

Usage: mkdir [OPTIONS] DIRECTORY...

Create DIRECTORY

-m MODE Mode
-p No error if exists; make parent directories as needed
ERROR: Job failed: exit code 1