chore: fix auto-approve workflow (aws#3814)

The condition could only pass for `pull_request` events. For most auto-approve PRs though this workflow would be triggered by `labeled` event, which requires a different condition.



---

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[Apache 2.0 license]: https://www.apache.org/licenses/LICENSE-2.0

.github/workflows/auto-approve.yml

@@ -12,7 +12,9 @@ on:
 
 jobs:
   auto-approve:
-    if: contains(github.event.pull_request.labels.*.name, 'auto-approve')
+    if: |
+      contains(github.event.pull_request.labels.*.name, 'auto-approve') ||
+      github.event.label.name == 'auto-approve'
     permissions:
       actions: write
       pull-requests: write