Document how to install postgres driver for qt

[jutoft]

Hello.
I have been trying to get giswater running in the following environment.

Ubuntu 24.04
QGis 1:3.34.12+40noble from apt repo https://qgis.org/ubuntu-ltr

QGIS is able to connect to the postgis database and execute queries, but when i try to open giswater it shows an error in the log
"driver not loaded" and then it shows a login dialog,.
I found out that QT is missing it's postgres driver.

Could it be added to the install guide that the package might be needed on ubuntu?

Missing package

sudo apt install libqt5sql5-psql