CP/DP Split: handle kill signal (#3260)

Problem: The data plane container was not properly handling the kill signal when the Pod was Terminated.

Solution: Update the entrypoint to catch the proper signals.

Author: sjberman

build/entrypoint.sh

@@ -6,11 +6,24 @@ handle_term() {
     echo "received TERM signal"
     echo "stopping nginx-agent ..."
     kill -TERM "${agent_pid}" 2>/dev/null
+    wait -n ${agent_pid}
     echo "stopping nginx ..."
     kill -TERM "${nginx_pid}" 2>/dev/null
+    wait -n ${nginx_pid}
+}
+
+handle_quit() {
+    echo "received QUIT signal"
+    echo "stopping nginx-agent ..."
+    kill -QUIT "${agent_pid}" 2>/dev/null
+    wait -n ${agent_pid}
+    echo "stopping nginx ..."
+    kill -QUIT "${nginx_pid}" 2>/dev/null
+    wait -n ${nginx_pid}
 }
 
 trap 'handle_term' TERM
+trap 'handle_quit' QUIT
 
 rm -rf /var/run/nginx/*.sock