SSL Support

[JonasScholl]

We actually don't have to implement anything on our own for SSL support, however I added the option to pass keyword arguments to the DB Engine in the DatabaseSetup constructor (which is a good idea anyways I guess). With psycopg2, you can also just require SSL via query parameter in the DB URI, but specifying it in the engine config is also valid.

Changelog:

• enable passing DB engine config in DatabaseSetup constructor
• add integration tests with SSL enabled

I had to do a bit of refactoring of the integration tests since adding table classes multiple times messed up the table medatata, but nothing big

resolves #7

[JonasScholl]

hmm, seems like the new docker-compose db setup doesn't work in the pipeline for some reason... works on my machine though 😂 will look into it

[yannicschroeer]

LGTM aside the tests 😄

[yannicschroeer]

I fixed your tests. The actual issue was: private key file "/var/lib/postgresql/server.key" must be owned by the database user or root I found a github issues that stated that the image already comes with certificates. I used them instead to fix it with the least effort.

3.9 Tests fail because of some typing stuff I think.