Setting up GitLab CI for iOS projects

What this post added

This post details the step-by-step process of setting up GitLab CI for iOS projects. It covers creating an Xcode project with unit and UI tests, sharing the Xcode scheme, setting up a `.gitignore` file, installing and registering a GitLab Runner on macOS with specific tags for toolchain and platform, and configuring the `.gitlab-ci.yml` file to use `xcodebuild` and `xcpretty` for cleaning, building, and testing iOS applications. It also highlights the importance of the `-destination` flag for specifying the simulator and OS version.