Deduplicate CI spam

[JacobCoffee]

Description

• removes multiple runs in PRs. we still run on merge, and in PRs but we dont run twice in PRs
• pulls migrations checkk into its own step
• spaces are freee

before:

after:

[hugovk]

I'd still like to be able to run the CI on feature branches in my fork, before opening PRs.

Can we configure it to still allow that?

[JacobCoffee]

@hugovk i think that would be enabled on the fork right? or do i need to add a workflow_dispatch for ci.yml?