Allow to land PRs with `UNSTABLE` merge status

[rvi]

Hi,
Thanks for the great tool, I've been using it for a day and I love it so far!

One thing that doesn't work well for me is I can't land a PR with an UNSTABLE merge status. Could we allow this? Maybe by passing a flag in argument?

[ZolotukhinM]

Are you talking about UNKNOWN? If so, then it's been fixed in #49 - we just haven't had a new release since that fix came in.

[rvi]

No I'm talking about UNSTABLE this happens when some checks are failing but they are optional checks. It would be great to allow to land in this case, something like: stack-pr land --allow-unstable

[TheCoreMan]

Hey @ZolotukhinM , I opened a PR which adds this functionality

CC: @rvi feel free to use the tool from my fork for now, just clone and pipx install . --force.