Add a scheduled job to produce nightly builds (#2598)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Author: cbeauchesne

.github/workflows/build_deploy.yml

@@ -10,6 +10,9 @@ on:
       expectedVersion:
         description: 'Expected version string'
         required: true
+  schedule:
+    # Nightly builds after weekdays
+    - cron:  0 2 * * 2-6
 
 jobs:
   build_wheels: