[2.4.0] Checkmk Werk 17360 created: mk_postgres.py: Enable using a system wide PGPASSFILE

[//]: # (werk v2) # mk_postgres.py: Enable using a system wide PGPASSFILE key | value ---------- | --- date | 2024-10-14T12:58:17+00:00 version | 2.4.0b1 class | fix edition | cre component | checks level | 1 compatible | yes The PGPASSFILE environment variable is only overwritten by the instance `pg_passfile` when it is not empty. It is possible now to use a system-wide PGPASSFILE environment variable.