remote: use winio DialPipeContext for named pipes

Signed-off-by: Ian King'ori <kingorim.ian@gmail.com>

driver/remote/driver.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/docker/buildx/driver"
+	util "github.com/docker/buildx/driver/remote/util"
 	"github.com/docker/buildx/util/progress"
 	"github.com/moby/buildkit/client"
 	"github.com/moby/buildkit/util/tracing/detect"
@@ -99,9 +100,8 @@ func (d *Driver) Dial(ctx context.Context) (net.Conn, error) {
 		return nil, errors.Errorf("invalid endpoint address: %s", d.InitConfig.EndpointAddr)
 	}
 
-	dialer := &net.Dialer{}
+	conn, err := util.DialContext(ctx, network, addr)
 
-	conn, err := dialer.DialContext(ctx, network, addr)
 	if err != nil {
 		return nil, errors.WithStack(err)
 	}

driver/remote/util/dialer_unix.go

@@ -0,0 +1,17 @@
+//go:build !windows
+// +build !windows
+
+package remote
+
+import (
+	"context"
+	"net"
+)
+
+func DialContext(ctx context.Context, network string, addr string) (net.Conn, error) {
+	dialer := &net.Dialer{}
+
+	conn, err := dialer.DialContext(ctx, network, addr)
+
+	return conn, err
+}

driver/remote/util/dialer_windows.go

@@ -0,0 +1,23 @@
+package remote
+
+import (
+	"context"
+	"net"
+
+	"github.com/Microsoft/go-winio"
+)
+
+func DialContext(ctx context.Context, network string, addr string) (net.Conn, error) {
+	var conn net.Conn
+	var err error
+
+	// dial context doesn't support named pipes
+	if network == "npipe" {
+		conn, err = winio.DialPipeContext(ctx, addr)
+	} else {
+		dialer := &net.Dialer{}
+		conn, err = dialer.DialContext(ctx, network, addr)
+	}
+
+	return conn, err
+}