Update .gitlab-ci.yml file

.gitlab-ci.yml

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+# This file is a template, and might need editing before it works on your project.
+# To contribute improvements to CI/CD templates, please follow the Development guide at:
+# https://docs.gitlab.com/ee/development/cicd/templates.html
+# This specific template is located at:
+# https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/LaTeX.gitlab-ci.yml
+
+---
+variables:
+  # Feel free to choose the image that suits you best.
+  # blang/latex:latest ... Former image used in this template. No longer maintained by author.
+  # listx/texlive:2020 ... The default, referring to TexLive 2020. Current at least to 2021-02-02.
+
+  # Additional alternatives with high Docker pull counts:
+  # thomasweise/docker-texlive-full
+  # thomasweise/texlive
+  # adnrv/texlive
+  LATEX_IMAGE: listx/texlive:2020
+
+build:
+  image: $LATEX_IMAGE
+  script:
+    - latexmk -pdf
+
+  artifacts:
+    paths:
+      - "*.pdf"