Merge pull request #1923 from Athanasius/fix/submodule-pr-spam

Switch off the submodule PR cronjob in favour of 'push to develop'

.github/workflows/submodule-update.yml

@@ -2,10 +2,10 @@
 name: Submodule Updates
 
 on:
-  #  push:
-  #    branches: [ develop ]
-  schedule:
-    - cron: '0 12 * * *'
+  push:
+    branches: [ develop ]
+  # schedule:
+  # - cron: '0 12 * * *'
 
 jobs:
   check_submodules: