Update: modify entrypoint for Markdown build and remove dependency on build_pdf

.gitlab-ci.yml

@@ -20,8 +20,7 @@ build_pdf:
 build_md:
   stage: convert
   image: pandoc/ubuntu-latex
-  dependencies:
-    - build_pdf
+  entrypoint: [""]
   script:
     - mkdir -p output
     - echo "Listing all .tex files:"