feat: add option to pass custom photon db url to cli/test-validator

[sergeytimoshin]

No description provided.

[SwenSchaeferjohann]

needs rebase otherwise lgtm! @sergeytimoshin

[SwenSchaeferjohann]

curious if there's a simple way to test the use of a custom db properly in ci?

[sergeytimoshin]

curious if there's a simple way to test the use of a custom db properly in ci?

We don't have test-validator test setup yet, so the first logical step would be to create validator cmd test.
As regards to custom db tests, I'm using psql docker env for my local tests, so we can just reuse that: run light test-validator => then pg_isready -- <db-url>