Update .gitlab-ci.yml

1 job for master in 1 minute and 34 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #81793549
pages

00:01:34

 
Name Stage Failure
failed
pages Test
npm ERR! notsup Not compatible with your operating system or architecture: grunt-appdmg@1.0.0
npm ERR! notsup Valid OS: darwin
npm ERR! notsup Valid Arch: any
npm ERR! notsup Actual OS: linux
npm ERR! notsup Actual Arch: x64

npm ERR! Please include the following file with any support request:
npm ERR! /builds/mlustosa/keeweb/npm-debug.log
ERROR: Job failed: exit code 1