Use mask in gather proxy behaviour

2 jobs for ahennequ_proxy in 24 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Test
passed check-copyright #17910085

00:00:13

failed check-formatting #17910086

00:00:24

 
Name Stage Failure
failed
check-formatting Test
   curl https://gitlab.cern.ch/lhcb/Phys/-/jobs/17910086/artifacts/raw/apply-formatting.patch | git am

=======================================
Uploading artifacts for failed job
Uploading artifacts...
apply-formatting.patch: found 1 matching files and directories

Uploading artifacts as "archive" to coordinator... ok
id=17910086 responseStatus=201 Created token=hxSkBa_5
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1