We use `timeout` from the coreutils package (should be part of many basic
installations - maybe with a different name) to force the individual
healthcheck commands too exit after a predefined timeout (300s); if this
doesn't help, send a SIGKILL.

This should help with the initial problem of hanging. A next step should
be to catch the `timeout` invoked exit and log this as an exceptional
happening.

Address #60

Instead of an external CronJob pod, or a supervisord cron daemon, we use
a subshell. Also we assume, the regular cronjob *also* needs to run when
the container starts. Insofar, we start the subshell, make sure it runs
a single time (and continues in the background) and then continue with
starting clarin-dspace.

Address #48

- sitemaps are now generated in the entrypoint script

  version to "latest"

files