ci: Remove pull_request trigger

Signed-off-by: Oliver Koenig <okoenig@nvidia.com>

.github/workflows/ci.yaml

@@ -3,14 +3,6 @@ name: CI
 on:
   schedule:
     - cron: '30 9 * * *'  # Pacific Time 01:30 AM in UTC
-  pull_request:
-    types:
-      - opened
-      - reopened
-      - ready_for_review
-      - synchronize
-    paths-ignore:
-      - '**.md'
   workflow_dispatch:
     inputs:
       PUBLISH:
@@ -78,16 +70,6 @@ jobs:
       MERGE_BUMPED_MANIFEST: ${{ steps.manifest-branch.outputs.MERGE_BUMBED_MANIFEST }}
       TEST_SUBSET: ${{ steps.testset.outputs.TEST_SUBSET }}
     steps:
-      - name: Cancel workflow run if the trigger is a draft PR
-        id: cancel-if-draft
-        if: github.event_name == 'pull_request' && github.event.pull_request.draft == true
-        run: |
-          echo "Cancelling workflow for draft PR"
-          curl -X POST -H "Authorization: token ${{ github.token }}" \
-                -H "Accept: application/vnd.github.v3+json" \
-                "https://api.github.com/repos/${{ github.repository }}/actions/runs/${{ github.run_id }}/cancel"
-          while true; do sleep 1; done  # blocks execution in case workflow cancellation takes time
-
       - name: Set build date
         id: date
         shell: bash -x -e {0}