Update benchmark.sh

functions/benchmark.sh

@@ -8,8 +8,12 @@ kuberhost="node1:32764"
 WRK_INSTALLED=$(which wrk)
 if [[ "$WRK_INSTALLED" -eq "" ]]
 then
-	apt update
-    apt install -y wrk
+	sudo apt-get install build-essential libssl-dev git -y
+	git clone https://github.com/wg/wrk.git wrk
+	cd wrk
+	make
+	# move the executable to somewhere in your PATH, ex:
+	sudo cp wrk /usr/local/bin
 fi
 
 HEY_INSTALLED=$(which hey)