Add system-tests on pushes on master + schedules (#9558)

Author: cbeauchesne

.github/workflows/run-system-tests.yaml

@@ -3,10 +3,18 @@ name: Run system tests
 on:
   pull_request:
   workflow_dispatch:
+  schedule:
+    - cron: 0 4 * * *
+  push:
+    branches:
+      - master
 
 # Cancel long-running jobs when a new commit is pushed
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
+  # this ensures that only one workflow runs at a time for a given branch on pull requests
+  # as the group key is the workflow name and the branch name
+  # for scheduled runs and pushes to master, we use the run id to ensure that all runs are executed
+  group: ${{ (github.event_name == 'pull_request' && format('{0}-{1}', github.workflow, github.ref)) || format('{0}-{1}', github.workflow, github.run_id) }}
   cancel-in-progress: true
 
 jobs: