Set up SwiftLint

[mokagio]

Description

Sets up SwiftLint in the project, so it runs via build phase and can also run locally via Fastlane.

Context: I'm going through our Swift codebases to ensure:

• SwiftLint is used locally
• SwiftLint is used in CI
• Hound is disabled

Testing Details

Add some empty lines in a Swift file then build, you should see a warning.

Run bundle exec fastlane lint. It should fail:

Run bundle exec fastlane format. It should pass and the empty line should be gone from Xcode

---

• Please check here if your pull request includes additional test coverage. – N.A.
• I have considered if this change warrants release notes and have added them to the appropriate section in the CHANGELOG.md if necessary. – N.A.

[mokagio]

Thank you for the review @crazytonyli . FYI, I might hold onto this and try a different approach via SPM. We'll see...

[mokagio]

I used SwiftLint via SPM in wordpress-mobile/WordPress-iOS-Shared#344. It works well for libraries that are configured as Swift Packages, because you can add it to Package.swift. This one isn't so I'd rather stick with the CocoaPods approach for the time being.

[observableobject]

Well done!