Update .gitlab-ci.yml add "expire_in: 1 week" parameter for artifacts in build.

5 jobs for FPGA-ns in 4 minutes and 24 seconds (queued for 114 minutes and 31 seconds)
Name Stage Failure
build:slo-severity-calculator Build
[ERROR] Please refer to dump files (if any exist) [date].dump, [date]-jvmRun[N].dump and [date].dumpstream.
[ERROR] -> [Help 1]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
Cleaning up file based variables
ERROR: Job failed: exit code 1