Foreground process fix

Sources/Swiftly/Init.swift

@@ -76,6 +76,7 @@ internal struct Init: SwiftlyCommand {
             These locations can be changed with SWIFTLY_HOME and SWIFTLY_BIN environment variables and run this again.
             \(installMsg)
             """)
+
             guard SwiftlyCore.promptForConfirmation(defaultBehavior: true) else {
                 throw SwiftlyError(message: "Swiftly installation has been cancelled")
             }

Sources/SwiftlyCore/Platform.swift

@@ -211,6 +211,10 @@ extension Platform {
         }
         process.waitUntilExit()
 
+        defer { if pgid != -1 {
+            tcsetpgrp(STDOUT_FILENO, pgid)
+        }}
+
         guard process.terminationStatus == 0 else {
             throw RunProgramError(exitCode: process.terminationStatus, program: args.first!)
         }
@@ -254,6 +258,10 @@ extension Platform {
 
         process.waitUntilExit()
 
+        defer { if pgid != -1 {
+            tcsetpgrp(STDOUT_FILENO, pgid)
+        }}
+
         guard process.terminationStatus == 0 else {
             throw RunProgramError(exitCode: process.terminationStatus, program: args.first!)
         }