driver: set netmode to host for container driver

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

driver/docker-container/driver.go

@@ -64,6 +64,7 @@ func (d *Driver) create(ctx context.Context, l progress.SubLogger) error {
 			Image: buildkitImage,
 		}, &container.HostConfig{
 			Privileged:  true,
+			NetworkMode: "host",
 		}, &network.NetworkingConfig{}, d.Name)
 		if err != nil {
 			return err