Blitz: Prompt to choose database engine on app creation

[yhoiseth]

Extracted from #1000. Writing this up as a new issue because #1000 was closed.

What do you want and why?

A way to choose which database engine to use (Postgres or SQLite) on app creation.

Possible implementation(s)

@flybayer wrote:

I think we should add a prompt to blitz new that asks if you want sqlite or postgres (same as we do now for form library).

Additional context

@flybayer also wrote:

We are going to remove the provider = ["sqlite", "postgres"] thing because it's causing too many problems.

(I couldn’t find an issue covering this point.)

[yhoiseth]

I don’t think I’ll get around to fixing this any time soon. So I removed myself as an assignee.

[flybayer]

Cool no problem! That's perfect @yhoiseth

[Dohxis]

I would love to work on this 🙂