pin fluentd version

Author: zanejohnson-azure

kubernetes/linux/setup.sh

@@ -78,6 +78,12 @@ echo "$(fluent-bit --version)" >> packages_version.txt
 
 # install fluentd
 fluentd_version="1.16.3"
+
+# Pre-install cool.io to avoid ARM64 build issues (segfault during native extension compilation)
+if [ "$ARCH" == "arm64" ]; then
+    gem install cool.io -v "1.8.0" --no-document
+fi
+
 gem install fluentd -v $fluentd_version --no-document
 
 # remove the test directory from fluentd