Don't always auth in gitlab-ci.yml

Signed-off-by: Snorre Magnus Davøen <snorre.davoen@nsd.uib.no>
1 job for master in 10 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #8768
test

00:00:10

 
Name Stage Failure
failed
test Test There is an unknown failure, please try again
yarn install v0.22.0
warning You don't appear to have an internet connection. Try the --offline flag to use the cache for registry queries.
warning log-schema-node@1.0.0: License should be a valid SPDX license expression
[1/4] Resolving packages...
[2/4] Fetching packages...
error An unexpected error occurred: "https://nexus.nsd.no/repository/npm-group/jayschema/-/jayschema-0.3.1.tgz: Request failed \"401 Unauthorized\"".
info If you think this is a bug, please open a bug report with the information provided in "/builds/nsd-commons/log-schema-node/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
ERROR: Job failed: exit code 1