tests: create remote with container helper

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>
(cherry picked from commit b1490ed5ce)

driver/driver.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"io"
 	"net"
+	"strings"
 
 	"github.com/docker/buildx/store"
 	"github.com/docker/buildx/util/progress"
@@ -67,6 +68,19 @@ type Driver interface {
 	Config() InitConfig
 }
 
+const builderNamePrefix = "buildx_buildkit_"
+
+func BuilderName(name string) string {
+	return builderNamePrefix + name
+}
+
+func ParseBuilderName(name string) (string, error) {
+	if !strings.HasPrefix(name, builderNamePrefix) {
+		return "", errors.Errorf("invalid builder name %q, must have %q prefix", name, builderNamePrefix)
+	}
+	return strings.TrimPrefix(name, builderNamePrefix), nil
+}
+
 func Boot(ctx, clientContext context.Context, d *DriverHandle, pw progress.Writer) (*client.Client, error) {
 	try := 0
 	for {