Added healthcheck that checks if network is still up

scripts/healthcheck.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+# Ping uses both exit codes 1 and 2. Exit code 2 cannot be used for docker health checks,
+# therefore we use this script to catch error code 2
+HOST=$HEALTH_CHECK_HOST
+
+if [ -z "$HOST" ]
+then
+    echo "Host  not set! Set env 'HEATH_CHECK_HOST'. For now, using default google.com"
+    HOST="google.com"
+fi
+
+ping -c 1 $HOST
+STATUS=$?
+if [ $STATUS -ne 0 ]
+then
+    echo "Network is down"
+    exit 1
+fi
+
+echo "Network is up"
+exit 0
+