manage: Added cron trigger to workflow validate.yml

Signed-off-by: Jaid <jaid.jsx@gmail.com>

Author: Jaid

.github/workflows/validate.yml

@@ -2,6 +2,8 @@ name: Validate and autofix
 on:
   push:
     branches: [master]
+  schedule:
+    - cron: 0 0 * * 1 # Every monday
 jobs:
   build:
     runs-on: ubuntu-latest