Add some more logs to bash script used for DockerHealthcheckWaitStratgyTest (#2988)

Co-authored-by: Sergei Egorov <[email protected]>
Co-authored-by: Richard North <[email protected]>

Author: 3 people

core/src/test/resources/health-wait-strategy-dockerfile/write_file_and_loop.sh

@@ -1,8 +1,8 @@
 #!/bin/ash
 
-echo sleeping
+set -ex
+
 sleep 2
-echo writing file
 touch /testfile
 
 while true; do sleep 1; done