Update .gitlab-ci.yml

.gitlab-ci.yml

-image: lbmc/pandoc:2.11
-
-stages:
-  - pages
+# This file is a template, and might need editing before it works on your project.
+# Full project: https://gitlab.com/pages/plain-html
 
 pages:
-  stage: pages
+  stage: deploy
+  image: lbmc/pandoc:2.11
   script:
+    - mkdir .public
     - make
   artifacts:
     paths:
       - public
-  only:
-    - master
-  environment:
-    name: ${CI_JOB_NAME}
-
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH