Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -5,7 +5,7 @@ pages:
   image: eicweb.phy.anl.gov:4567/containers/eic_container/debian_base:testing
   stage: deploy
   rules:
-    - if: '$CI_SERVER_HOST == "gitlab.phy.anl.gov" && $CI_COMMIT_BRANCH == "master"' 
+    - if: '$CI_SERVER_HOST == "gitlab.phy.anl.gov" && $CI_COMMIT_BRANCH == "main"' 
   script:
     - git clone -b 6.1.0 https://github.com/root-project/jsroot.git public
     - cp .htaccess public/.