Remove LANG and LANGUAGE from environment

[floatdrop]

LANG and LANGUAGE should be set by container image, not by drone.

[bradrydzewski]

Thanks for this. One minor request. Can we keep the lang and language for the default drone/images? https://github.com/floatdrop/drone/blob/master/shared/build/build.go#L450

    switch {
    case strings.HasPrefix(b.Build.Image, "bradrydzewski/"),
        strings.HasPrefix(b.Build.Image, "drone/"):
+       f.WriteEnv("LANG", "en_US.UTF-8")       
+       f.WriteEnv("LANGUAGE", "en_US:en")
        dockerfile.WriteUser("ubuntu")
        dockerfile.WriteEnv("LOGNAME", "ubuntu")
        dockerfile.WriteEnv("HOME", "/home/ubuntu")
        dockerfile.WriteRun("sudo chown -R ubuntu:ubuntu /var/cache/drone")
        dockerfile.WriteRun("sudo chown -R ubuntu:ubuntu /usr/local/bin/drone")
    default:

This will keep things backward compatible for now when using the official Drone images, but will prevent them from being set in custom images.