Update .gitlab-ci.yml

1 job for master in 22 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
failed pdf #393307

00:00:22

 
Name Stage Failure
failed
pdf Test
Running before_script and script
$ apt-get -y install texlive-xetex xelatex ./Git/git_guide.tex xelatex ./Terminal/terminal_guide.tex xelatex ./VSCode/vscode_guide.tex
Reading package lists...
E: Unsupported file ./Git/git_guide.tex given on commandline
E: Unsupported file ./Terminal/terminal_guide.tex given on commandline
E: Unsupported file ./VSCode/vscode_guide.tex given on commandline
Running after_script
Uploading artifacts for failed job
ERROR: Job failed: exit code 1