Updated workflow to run on main on push

Author: Badhi

.github/workflows/unit_tests.yml

@@ -7,7 +7,7 @@ name: CI
 on:
   # Triggers the workflow on push or pull request events but only for the master branch
   push:
-    branches: [ master ]
+    branches: [ master, main ]
   pull_request:
     types: [opened, synchronize, reopened, ready_for_review]
     branches: