chore(ci): add comment on runner perf issues

Signed-off-by: Luca Guerra <[email protected]>

.github/workflows/reusable_test_packages.yaml

@@ -27,6 +27,7 @@ permissions:
 jobs:
   test-packages:
     # See https://github.com/actions/runner/issues/409#issuecomment-1158849936
+    # ARM64 tests are currently failing with small GHA runners and so they are timing out
     runs-on: ${{ (inputs.arch == 'aarch64' && 'github-arm64-2c-8gb') || 'ubuntu-latest' }}
     steps:
       - name: Download binary