strip `_acme-challenge.` prefix should be discouraged

[zhangyoufu]

There is one more DNS-based ACME challenge type dns-account-01 being introduced. It's using DNS record "_" || base32(SHA-256(<ACCOUNT_URL>)[0:10]) || "._acme-challenge".

• https://datatracker.ietf.org/doc/draft-ietf-acme-dns-account-label/01/
• feat: Support for dns-account-01 Challenge letsencrypt/boulder#8149

---

When looking up ACME-DNS account via domain name, libdns/acmedns strips _acme-challenge. prefix before performing the lookup.

acmedns/provider.go

Lines 67 to 72 in 55d190b

	func (p *Provider) selectAccount(zone string, name string) (*account, error) {
	if p.Configs != nil {
	domain := libdns.AbsoluteName(name, zone)
	domain = strings.Trim(domain, ".")
	domain = strings.TrimPrefix(domain, acmePrefix)
	config, found := p.Configs[domain]

This stripping should be discouraged, to avoid inconsistency that dns-01 challange type needs to be configured in example.com entry while dns-account-01 challenge type needs to be configured in _XXXXXXXXXXXXXXXX._acme-challenge.example.com.