Merge branch 'main' into split-voltage-for-apd90-calc-variant

Author: martinjrobins

.github/workflows/ubuntu-tests.yml

@@ -79,7 +79,7 @@ jobs:
         working-directory: build
 
       - name: Slack notification
-        if: failure()
+        if: ${{ failure() && github.event_name == 'schedule' }}
         uses: slackapi/slack-github-action@v2.0.0
         with:
           method: chat.postMessage