Make DESDEO2 runnable on Rahti

[juropo]

I added the necessary s2i scripts to make it possible to build DESDEO2 into an image using s2i.

Also, updated some of the database code.

• The config file is now actually used for database connections. You might need to update it for your local testing.
• Changed how the database is cleared if database already exists when db_init is called. I don't think this will change how it will work for anyone else, but this solution avoids problems with user rights when using pukki database service.

[light-weaver]

Feel free to merge it if it works. Mai needs this for the work that she's doing.

[juropo]

I also fixed the issue with terrible database configs while I was there.
This works on Rahti, and I don't think it should cause any issues for anyone testing stuff locally. Just make sure to check your database settings if you do.