Modifies the default signal sent to nginx when terminating the contai…

…ner to allow graceful exit.

Solution provided by @groyoh in #149 (comment)

Closes #149

image/nginx-passenger.sh

@@ -48,6 +48,10 @@ run touch /etc/service/nginx/down
 run mkdir /etc/service/nginx-log-forwarder
 run cp /pd_build/runit/nginx-log-forwarder /etc/service/nginx-log-forwarder/run
 
+## Use SIGQUIT instead of SIGTERM to shutdown nginx
+run mkdir -p /etc/service/nginx/control/
+run cp /pd_build/runit/nginx-term /etc/service/nginx/control/t
+
 run mkdir /var/run/passenger-instreg
 
 run sed -i 's|invoke-rc.d nginx rotate|sv 1 nginx|' /etc/logrotate.d/nginx

image/runit/nginx-term

@@ -0,0 +1,4 @@
+#!/bin/bash
+set -e
+
+sv q nginx