Expose DataBase.xml jdbcParameters as environment variable

[justin-watkinson-electric]

Is your feature request related to a problem? Please describe.
When configuring JAMF Pro with Amazon Aurora, we learned that the default connection string in the DataBase.xml needed to be modified.

Describe the solution you'd like
I'd like to update this section of the configuration.sh file to also include an environment variable override for the jdbcParameters XML field.

Describe alternatives you've considered
Given that the ROOT.war is still compressed at bootstrap, I didn't see many non-invasive alternatives that didn't involve modifying the docker image posted to Docker hub.

[battlecow]

Thanks for the request, this should be completed in #26. Added both the ability to override via ENV as requested, but also as an entire DataBase.xml file mounted to /config in case the interpolation gets weird.