Add scheduled test at the first day of every month

Author: latchdevel

.github/workflows/BuildTest.yml

@@ -23,6 +23,10 @@ on:
       - 'src/**'
       - 'libs/**'
 
+  # Scheduled the first day of every month at 00:00h UTC
+  schedule:
+    - cron:  '0 0 1 * *'
+
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch: