Try to fix pipline

.gitlab-ci.yml

@@ -1,12 +1,16 @@
-image: "debian:buster-slim"
+image: debian:buster-slim
+
+stages:
+    - pdf
 
 before_script:
     - apt update && apt upgrade -y && apt install texlive-latex-base texlive-latex-extra texlive-lang-french -y
 
-export_pdf:
+build-pdf:
+    stage: pdf
     script:
-        - for i in `ls *.tex`; do pdflatex --interaction=nonstopmode $i; done
+        - "for i in `ls *.tex`; do pdflatex --interaction=nonstopmode $i; done"
     artifacts:
         paths:
-            - *.pdf
+            - "*.pdf"