Revert "Temporary remove scheduled tests"

This reverts commit 2984f88.

Author: JulioAPeraza

.github/workflows/testing.yml

@@ -7,6 +7,9 @@ on:
   pull_request:
     branches:
       - '*'
+  schedule:
+    # Run tests every Sunday at 12am
+    - cron: '0 0 * * 0'
 
 concurrency:
   group: environment-${{ github.ref }}