code: func (t *Template) WithEnvS(envs []string) *Template {
  	var result = map[string]string{}
  	for _, env := range envs {
  		var parts = strings.SplitN(env, "=", 2)
  		result[parts[0]] = parts[1]
  	}
  	return t.WithEnv(result)
  }
docs: // WithEnvS overrides template's env field with the given KEY=VALUE list of
  // environment variables