Remove Invenia Nightly CI runs

Author: oxinabox

.github/workflows/CI.yml

@@ -4,8 +4,6 @@ on:
     branches: [main]
     tags: [v*]
   pull_request:
-  schedule:
-    - cron: '0 2 * * *'  # Daily at 2 AM UTC (8 PM CST)
 
 jobs:
   test:
@@ -48,18 +46,3 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
 
-  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 }}