Update .gitlab-ci.yml

1 job for develop in 43 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
failed #22659
build

00:00:43

 
Name Stage Failure
failed
build Build

Done in 30.23s.
$ grunt default
Running "sass:dist" (sass) task
Fatal error: Invalid CSS after "&": expected "{", was "&"

"&" may only be used at the beginning of a compound selector.
Cleaning up file based variables
ERROR: Job failed: exit code 1