creds.go
func CredentialsFromEnvVars() *Credentials {
	return &Credentials{
		ClientID:    os.Getenv("TASKCLUSTER_CLIENT_ID"),
		AccessToken: os.Getenv("TASKCLUSTER_ACCESS_TOKEN"),
		Certificate: os.Getenv("TASKCLUSTER_CERTIFICATE"),
	}
}
func CredentialsFromEnvVars() *Credentials {
	return &Credentials{
		ClientID:    os.Getenv("TASKCLUSTER_CLIENT_ID"),
		AccessToken: os.Getenv("TASKCLUSTER_ACCESS_TOKEN"),
		Certificate: os.Getenv("TASKCLUSTER_CERTIFICATE"),
	}
}
// CredentialsFromEnvVars creates and returns Taskcluster credentials
// initialised from the values of environment variables:
//
//  TASKCLUSTER_CLIENT_ID
//  TASKCLUSTER_ACCESS_TOKEN
//  TASKCLUSTER_CERTIFICATE
//
// No validation is performed on the assigned values, and unset environment
// variables will result in empty string values.