CLI (run): Only ask for stdin for -i (#483)

Today if you asked for a pty and also wanted to detach we'd open stdin
and then immediately close that pipe which would close the guest relay
as well. I don't believe we need stdin open unless it's asked for with
-i. Truthfully there's one extra bit here that is needed which is if -i
and -d are supplied we need to tell the daemon to open stdin, but not
send an fd (as they're client supplied and the client/cli is going to
exit immediately). That will need to be a followup, as it's mainly
useful for attach which we don't have today.

Sources/CLI/RunCommand.swift

@@ -205,30 +205,28 @@ struct ProcessIO {
         var stdio = [FileHandle?](repeating: nil, count: 3)
 
         let stdin: Pipe? = {
-            if !interactive && !tty {
+            if !interactive {
                 return nil
             }
             return Pipe()
         }()
 
         if let stdin {
-            if interactive {
-                let pin = FileHandle.standardInput
-                let stdinOSFile = OSFile(fd: pin.fileDescriptor)
-                let pipeOSFile = OSFile(fd: stdin.fileHandleForWriting.fileDescriptor)
-                try stdinOSFile.makeNonBlocking()
-                nonisolated(unsafe) let buf = UnsafeMutableBufferPointer<UInt8>.allocate(capacity: Int(getpagesize()))
+            let pin = FileHandle.standardInput
+            let stdinOSFile = OSFile(fd: pin.fileDescriptor)
+            let pipeOSFile = OSFile(fd: stdin.fileHandleForWriting.fileDescriptor)
+            try stdinOSFile.makeNonBlocking()
+            nonisolated(unsafe) let buf = UnsafeMutableBufferPointer<UInt8>.allocate(capacity: Int(getpagesize()))
 
-                pin.readabilityHandler = { _ in
-                    Self.streamStdin(
-                        from: stdinOSFile,
-                        to: pipeOSFile,
-                        buffer: buf,
-                    ) {
-                        pin.readabilityHandler = nil
-                        buf.deallocate()
-                        try? stdin.fileHandleForWriting.close()
-                    }
+            pin.readabilityHandler = { _ in
+                Self.streamStdin(
+                    from: stdinOSFile,
+                    to: pipeOSFile,
+                    buffer: buf,
+                ) {
+                    pin.readabilityHandler = nil
+                    buf.deallocate()
+                    try? stdin.fileHandleForWriting.close()
                 }
             }
             stdio[0] = stdin.fileHandleForReading