Postgresql does not work

[sidey79]

Describe the bug

Using a postgresql database for dblog, causes an errror:

https://forum.fhem.de/index.php?topic=89745.msg1319071#msg1319071

To Reproduce
Steps to reproduce the behavior:

1. create db.conf with postgresql

####################################################################################
#
## for PostgreSQL
####################################################################################
%dbconfig= (
    connection => "Pg:database=fhem;host=pgdb",
    user => "postgres",
    password => "postgres"
);

3. define a DBLog definition using the db.conf file named pgDbLog
4. Look in the logfile for the following error:

pgDbLog - ERROR: install_driver(Pg) failed: Attempt to reload DBD/Pg.pm aborted.
Compilation failed in require at (eval 404) line 3.

 at ./FHEM/93_DbLog.pm line 2559.

Expected behavior
dblog connects to postgredatabase without compilation failed error

Docker Image 4.0.4-Bullsexe

Additional context
Reported at forum:
https://forum.fhem.de/index.php?topic=89745.msg1319071#msg1319071