Waiting for services to be up and running...
Pulling docker image docker:stable ...
Using docker image sha256:fd7e073eb60f300c2e6c7e4035e23fff313c3a72f73c704a52095f0db736e62e for docker:stable ...
section_start:1541182114:prepare_script
Running on runner-a334e492-project-1975139-concurrent-0 via runner-a334e492-gitlab-runner-autoscale-1541168468-3db41918...
section_end:1541182115:prepare_script
section_start:1541182115:get_sources
Fetching changes...
HEAD is now at c2932f00 Added build all functionality to `bst build`
Checking out a60bcddd as jmac/make_writable_combination...
fatal: reference is not a tree: a60bcddd744cc01869bc3d01d691c2483edac756
section_end:1541182117:get_sources
section_start:1541182117:upload_artifacts_on_failure
section_end:1541182118:upload_artifacts_on_failure
ERROR: Job failed: exit code 1