Standardize scripts, use bash and double brackets

scripts/healthcheck.sh

@@ -1,9 +1,9 @@
-#!/bin/sh
+#!/bin/bash
 # 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=$HEALTH_CHECK_HOST
+HOST=${HEALTH_CHECK_HOST}
 
-if [ -z "$HOST" ]
+if [[ -z "$HOST" ]]
 then
     echo "Host  not set! Set env 'HEATH_CHECK_HOST'. For now, using default google.com"
     HOST="google.com"
@@ -11,12 +11,11 @@ fi
 
 ping -c 1 $HOST
 STATUS=$?
-if [ $STATUS -ne 0 ]
+if [[ ${STATUS} -ne 0 ]]
 then
     echo "Network is down"
     exit 1
 fi
 
 echo "Network is up"
-exit 0
-
+exit 0