Werk #15323: mk_postgres: Adapt environment file parsing

Component	Checks & agents
Title	mk_postgres: Adapt environment file parsing
Date	Jan 31, 2024
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.4.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.3.0p14 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p33 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Reading variables from the environment file was adapted: Lines starting with # will now be ignored.

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