The most final fix.

.gitlab-ci.yml

@@ -26,7 +26,7 @@ artifacts:
   stage: build
   script:
   - ./install-font-debian.sh
-  - printf "\providecommand{\version}{%s}" $(echo $CI_BUILD_REF | cut -c1-8) > version.tex
+  - printf "\providecommand{\\\version}{%s}" $(echo $CI_BUILD_REF | cut -c1-8) > version.tex
   - ./build.sh
   - mv dist/*.pdf .
   artifacts: