bug: #219 doesn't allow for skipping cache/db readiness checks

[peterschutt]

#219 introduced a change to the run-app script where the database/cache readiness checks were moved into the before start lifespan hook in starlite.

This means that the args --no-db etc are no longer a part of the startup script, and therefore we no longer have a way to skip them.

Maybe we can just add configs to the plugin config object that allow them to be explicitly skipped.

[gazorby]

Isn't this solved by 76b5928?

[peterschutt]

Yep, I should have closed this off!