Update main.yml

Author: dmjio

.github/workflows/main.yml

@@ -30,7 +30,7 @@ jobs:
           path: ./doc_build
 
   deploy:
-    if: github.ref == 'refs/heads/main'
+    if: github.ref == 'refs/heads/master'
     runs-on: ubuntu-latest
 
     environment: