Update main.yml

once a month instead of once a week

Author: cokelaer

.github/workflows/main.yml

@@ -8,7 +8,7 @@ on:
   pull_request:
     branches-ignore: []
   schedule:
-    - cron: '0 0 * * SUN'
+    - cron: '0 0 1 * *'
 
 jobs:
   build-linux: