[CI] run ci-cd workflow nightly

This should help detect if changes in the latest published trace server
interfere with the tsp-python-client.

Signed-off-by: Marc Dumais <marc.dumais@ericsson.com>

.github/workflows/ci-cd.yml

@@ -7,6 +7,8 @@ on:
   pull_request:
     branches:
       - master
+  schedule:
+    - cron: '0 2 * * *' # Runs every day at 2am: https://docs.github.com/en/actions/reference/events-that-trigger-workflows#scheduled-events-schedule
 
 jobs:
   Setup-and-Test: