Imports github.com/go-acme/lego/v4/certcrypto github.com/go-acme/lego/v4/certificate github.com/go-acme/lego/v4/lego github.com/go-acme/lego/v4/providers/dns github.com/go-acme/lego/v4/registration Standard library imports crypto crypto/ecdsa crypto/elliptic crypto/rand crypto/x509 encoding/json flag fmt io/ioutil os os/exec os/signal strings syscall time