Disable Nightly CI runs

There isn't anyone monitoring these at Invenia anymore so disable the runs

Author: oxinabox

.github/workflows/CI.yml

@@ -1,8 +1,6 @@
 name: CI
 # Run on master, tags, or any pull request
 on:
-  schedule:
-    - cron: '0 2 * * *'  # Daily at 2 AM UTC (8 PM CST)
   push:
     branches: [main]
     tags: ["*"]
@@ -59,22 +57,6 @@ jobs:
         with:
           file: lcov.info
 
-  slack:
-    name: Notify Slack Failure
-    needs: test
-    runs-on: ubuntu-latest
-    if: always() && github.event_name == 'schedule'
-    steps:
-      - uses: technote-space/workflow-conclusion-action@v2
-      - uses: voxmedia/github-action-slack-notify-build@v1
-        if: env.WORKFLOW_CONCLUSION == 'failure'
-        with:
-          channel: nightly-rse
-          status: FAILED
-          color: danger
-        env:
-          SLACK_BOT_TOKEN: ${{ secrets.INVENIA_SLACK_BOT_TOKEN }}
-
   docs:
     name: Documentation
     runs-on: ubuntu-latest