Fix up test stack (#398)

Former-commit-id: 088105c7829254fc8ff1f31b71d28fd916def7eb

app/data/container-build/cerc-test-container/run.sh

@@ -1,11 +1,14 @@
-#!/bin/sh
-
+#!/usr/bin/env bash
+set -e
+if [ -n "$CERC_SCRIPT_DEBUG" ]; then
+  set -x
+fi
 # Test if the container's filesystem is old (run previously) or new
 EXISTSFILENAME=/var/exists
 echo "Test container starting"
 if [[ -f "$EXISTSFILENAME" ]];
 then
-    TIMESTAMP = `cat $EXISTSFILENAME`
+    TIMESTAMP=`cat $EXISTSFILENAME`
     echo "Filesystem is old, created: $TIMESTAMP" 
 else
     echo "Filesystem is fresh"