Configuration of Datasources with ENV Variable should be included

The supported database versions, which are available also with templates, are PostGreSQL and MySQL.
Other like Oracle and MSSQL are not available inside of the pod/project.
But there are Environment Variables to configure that datasources.
Also a description how to add the driver for this is not available.

An example is this (for H2 but it can be used for others as well to create the DS):
The way to configure it is with env-var like this:
DATASOURCES=ACCOUNTS_H2
ACCOUNTS_H2_DATABASE=accounts
ACCOUNTS_H2_JNDI=java:/accounts-ds
ACCOUNTS_H2_DRIVER=h2
ACCOUNTS_H2_JTA=true
ACCOUNTS_H2_NONXA=true
ACCOUNTS_H2_USERNAME=sa
ACCOUNTS_H2_PASSWORD=sa
ACCOUNTS_H2_URL="jdbc:h2:/opt/eap/standalone/data/databases/h2/accounts"

1. required, but unused...
   ACCOUNTS_H2_SERVICE_HOST=dummy
   ACCOUNTS_H2_SERVICE_PORT=12345