Set CI to run on master (#349)

Author: AngelOnFira

.github/workflows/ci.yml

@@ -1,11 +1,8 @@
 name: CI
 
 on:
-  # NOTE: temporarily disabled because on-push currently uses up too many resources
-  # push:
-  #   branches: [master]
-  schedule:
-    - cron:  '0 21 * * *'
+  push:
+    branches: [master]
   pull_request:
     branches: [master]