fix(context): supply PR to bundle-compare

Signed-off-by: Aviv Keller <me@aviv.sh>

Author: avivkeller

.github/workflows/bundle-compare.yml

@@ -67,3 +67,4 @@ jobs:
         with:
           comment-tag: 'compare_bundle_size'
           message: ${{ steps.compare-bundle-size.outputs.comment }}
+          pr-number: ${{ github.event.workflow_run.pull_requests[0].number }}