feat: Don't allow the merging of PRs when they don't have a clean state [WIP]

[Gustrb]

I still have some stuff do do before marking it as "Ready to Review"

• Write some tests
• Validate locally everything works fine
• Validate the text message, I added some simple copy, might not be good enough

I am just starting with this so might take some time :) All advice is appreciated

Closes #452

[bncer]

Hi, @Gustrb!
I also was working on it.
Here is my version - [block approval commit] (bncer@c2493ad)
I included - OctocrabMergeableState::Blocked noticing here

[Gustrb]

Hey @bncer should we maybe merge the OctocrabMergeableState::Blocked state as well?
Don't know if there are more to this than that, but we can collaborate if you wish :)

[bncer]

Yeah, definitely we can work together.

As for MergeableState::Blocked octocrab uses enum what was provided from github api. I can only find API doc from GraphQL API. I think it should be included in merge conflict state.

[bncer]

@Gustrb I set up local environment by hard coding some required fields.
I can help to setup, if you have some issues.

[Kobzol]

Hi, thanks for the PR! :) I just wanted to note that I'm having a very busy week right now, and probably won't have time to take a look until next week.