Add the initial Dockerfile for the stop_demo

[refs #fe9e05d2c115 #64f1a7b1e048]

Author: jfahrer

stop_demo/Dockerfile

@@ -0,0 +1,6 @@
+FROM alpine:latest
+
+RUN apk update && apk add bash
+COPY traptest.sh /
+
+CMD ["/traptest.sh"]

stop_demo/traptest.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+trap "echo Received SIGTERM > /dev/stderr" SIGTERM
+trap "echo Received SIGINT  > /dev/stderr" SIGINT
+trap "echo Received SIGHUP  > /dev/stderr" SIGHUP
+trap "echo Received SIGQUIT > /dev/stderr" SIGQUIT
+echo "Started with PID $$"
+
+while :     # This is the same as "while true".
+do
+  sleep 0.1 # This script is not really doing anything.
+  wait
+done