fixup: Ensure compatibility with gnu mktemp

Author: maru-ava

scripts/tests.e2e.persistent.sh

@@ -24,7 +24,7 @@ if [[ -z "${AVALANCHEGO_PATH}" ]]; then
 fi
 
 # Create a temporary directory to store persistent network
-ROOT_DIR="$(mktemp -d -t e2e-testnet)"
+ROOT_DIR="$(mktemp -d -t e2e-testnet.XXXXX)"
 
 # Ensure network cleanup on teardown
 function cleanup {