drop cache entirely

.github/workflows/pr-comment.yaml

@@ -5,10 +5,10 @@ on:
     types: [completed]
 jobs:
   pr_comment:
-    if: github.event.workflow_run.event == 'pull_request' && github.event.workflow_run.conclusion == 'success'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/github-script@v6
+        continue-on-error: true
         with:
           # This snippet is public-domain, taken from
           # https://github.com/oprypin/nightly.link/blob/master/.github/workflows/pr-comment.yml