Update .gitlab-ci.yml

3 jobs for master in 45 seconds (queued for 1 second)
Status Job ID Name Coverage
  Deploy
failed #2655
deploy

00:00:45

failed #2654
deploy

00:00:46

failed #2653
deploy

00:00:46

 
Name Stage Failure
failed
deploy Deploy
  =====Latex reported missing or unavailable character(s).
=====See log file for details.
Collected error summary (may duplicate other messages):
pdflatex: Command for 'pdflatex' gave return code 1
Refer to 'main.log' for details
Latexmk: Use the -f option to force complete processing,
unless error was exceeding maximum runs, or warnings treated as errors.
make: *** [Makefile:24: 424-Systeme_Non_Lineaires/Cours/main.pdf] Error 12
ERROR: Job failed: exit code 1