Add errorhandling for ulimit

[glemsom]

In case the container is not spawned with SYS_RESOURCE, setting unlimited size for coredumps will never work. Since the defaults in the script is to abort on any uncaught errors - I propose we catch the ulimit error, and notify the user about the possible missing capability.

This fixes issues like https://github.com/zalando/postgres-operator/issues/2387

[hughcapet]

I would abstain from adding any specific configuration suggestions to the logging here but let's add the error handling anyway. Thanks.

[idanovinda]

👍

[hughcapet]

👍