Werk #12820: mk_postgres: fixed user detection: use default user "postgres" in case of error

Component Checks & Agents
Title mk_postgres: fixed user detection: use default user "postgres" in case of error
Date Jul 22, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.1.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

This werk fixes the user detection for postgresql docker images. If the user could no be determined the fallback user "postgres" is used.

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