controller: default to using local controller

--detach shouldn't be the default yet, since it still has the potential
to leak some sessions in odd edge cases, and is slightly more painful to
debug.

For now, we should set the local controller as the default, with the
idea that we can change it back in the future.

Signed-off-by: Justin Chadwell <me@jedevc.com>

commands/build.go

@@ -11,7 +11,6 @@ import (
 	"log"
 	"os"
 	"path/filepath"
-	"runtime"
 	"strconv"
 	"strings"
 
@@ -496,7 +495,7 @@ func buildCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 	if isExperimental() {
 		flags.StringVar(&invokeFlag, "invoke", "", "Invoke a command after the build [experimental]")
 		flags.StringVar(&options.Root, "root", "", "Specify root directory of server to connect [experimental]")
-		flags.BoolVar(&options.Detach, "detach", runtime.GOOS == "linux", "Detach buildx server (supported only on linux) [experimental]")
+		flags.BoolVar(&options.Detach, "detach", false, "Detach buildx server (supported only on linux) [experimental]")
 		flags.StringVar(&options.ServerConfig, "server-config", "", "Specify buildx server config file (used only when launching new server) [experimental]")
 	}