reduce the number of latex packages to install

.gitlab-ci.yml

@@ -17,7 +17,14 @@ check_filenames:
 
 make_pdf:
   script:
-    - tlmgr install fvextra newunicodechar doulossil luacode ctex enumitem selnolig latexmk
+    - tlmgr repository remove main
+    - tlmgr repository add https://mirror.ctan.org/systems/texlive/tlnet main
+    # Please try to keep this list short and document the purpose of each package
+    #
+    #               syntax highlight   Chinese               required by pandoc's latex template
+    #               |       IPA        |    custom list      |
+    #               |       |          |    |        compile |
+    - tlmgr install fvextra cm-unicode ctex enumitem latexmk selnolog
     - ./make-pdf.py
   artifacts:
     paths: