Githawk: Add Danger or equivalent

[Huddie]

As mentioned in #2514 the project is getting bigger and a bot would help @rnystrom with PR + other automation (like: #2405).

We discussed adding Danger to the project, I think @BasThomas suggested some derivative of Danger (Peril?). I guess this issue is to spark conversation on exactly which bot, what it can do for the project and get this thing moving a bit.

[rnystrom]

Open to suggestions!

[Huddie]

Here are a few:

• Xcode Summary: Displays warnings/failed tests/errors in PRs
• Changelog: With the new feature banner coming to GitHawk we have to update the Release-Notes repo. To make life easier, all new feature PRs should be required to enter a short blurb in the changelog so that we can easily create release notes. Changelog would be housed in the GitHawk repo. Danger will check for a change in the CHANGELOG.md and if none are found, comment on the PR.
• Auto Label: Labeling PRs will make tracking them easier. If the title of a PR contains [WIP] it will be assigned a WIP label, this can be expanded to add "waiting-on-review" or "ready-to-pull". Not all contributors have access to adding labels so this is a good way to keep PRs tracked.
• SwiftFormat/ SwiftLint: We currently use swiftlint, I think SwiftFormat can make PR review a bit simpler since SwiftFormat + Danger will auto-format the project when PRs get merged. If we use SwiftLint, we should also add it to Danger so that Danger can comment a SwiftLint report. We may be able to use this + auto label to make it so that only once no lint issues appear can you request a review/ get an "waiting-for-review" label added by Danger

[BasThomas]

Regarding Danger / Peril: I feel like Danger does enough for us at this point, and would be easier to setup (no server needed).

[Huddie]

964 just to tag it since this could close that issue

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[Huddie]

If we could also make it that danger reports why builds are failing that could be helpful. Either spit back exactly what Bitrise error is or for example
If a new file was added but .pbxproj wasn’t updated, inform user of the issue

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