[#498] Create Enum for gifhub runner type

Scripts/Swift/iOSTemplateMaker/Sources/iOSTemplateMaker/SetUpCICDService.swift

@@ -21,6 +21,22 @@ struct SetUpCICDService {
             }
         }
     }
+
+    enum GithubRunnerType {
+
+        case macOSLatest, selfHosted
+
+        init?(_ name: String) {
+            switch name.lowercased() {
+            case "m", "macOS":
+                self = .macOSLatest
+            case "s", "self-hosted":
+                self = .selfHosted
+            default:
+                return nil
+            }
+        }
+    }
 
     private let fileManager = FileManager.default
 
@@ -33,14 +49,10 @@ struct SetUpCICDService {
 
         switch service {
         case .github:
-            var runnerType: String?
+            var runnerType: GithubRunnerType?
             while runnerType == nil {
                 print("Which workflow runner do you want to use? [(m)acos-latest/(s)elf-hosted]: ")
-                runnerType = readLine()?.lowercased()
-                if runnerType != "m" && runnerType != "s" {
-                    print("Invalid input. Please enter 'm' for macOS-latest or 's' for self-hosted.")
-                    runnerType = nil
-                }
+                runnerType = GithubRunnerType(readLine().string)
             }
             print("Setting template for Github Actions")
             fileManager.removeItems(in: "bitrise.yml")