fix: acme dns challenge fail with two certificates for the same domain zone

[Bisstocuz]

Related issue #528

Error message:

1.68135842274485e+09    info    obtain  acquiring lock  {"identifier": "*.example.com"}
1.6813584227451315e+09  info    maintenance     started background certificate maintenance      {"cache": "0xc0003018f0"}
1.6813584227469733e+09  info    obtain  lock acquired   {"identifier": "*.example.com"}
1.6813584227471385e+09  info    obtain  obtaining certificate   {"identifier": "*.example.com"}
1.68135842274761e+09    info    waiting on internal rate limiter        {"identifiers": ["*.example.com"], "ca": "https://acme-v02.api.letsencrypt.org/directory", "account": "admin@example.com"}
1.6813584227476232e+09  info    done waiting on internal rate limiter   {"identifiers": ["*.example.com"], "ca": "https://acme-v02.api.letsencrypt.org/directory", "account": "admin@example.com"}
1.6813584256117125e+09  info    acme_client     trying to solve challenge       {"identifier": "*.example.com", "challenge_type": "dns-01", "ca": "https://acme-v02.api.letsencrypt.org/directory"}
1.6813584295660403e+09  error   acme_client     cleaning up solver      {"identifier": "*.example.com", "challenge_type": "dns-01", "error": "no memory of presenting a DNS record for "_acme-challenge.example.com" (usually OK if presenting also failed)"}
1.681358429566284e+09   info    acme_client     authorization finalized {"identifier": "*.example.com", "authz_status": "valid"}
1.6813584295663383e+09  info    acme_client     validations succeeded; finalizing order {"order": "https://acme-v02.api.letsencrypt.org/acme/order/1052573887/175858912547"}
1.6813584313439014e+09  info    acme_client     successfully downloaded available certificate chains    {"count": 2, "first_url": "https://acme-v02.api.letsencrypt.org/acme/cert/04270614245b3144156d4dbc7added15cec7"}
1.6813584313445919e+09  info    obtain  certificate obtained successfully       {"identifier": "*.example.com"}
1.6813584313446202e+09  info    obtain  releasing lock  {"identifier": "*.example.com"}
1.681358432637552e+09   info    obtain  acquiring lock  {"identifier": "example.com"}
1.6813584326390805e+09  info    obtain  lock acquired   {"identifier": "example.com"}
1.6813584326391814e+09  info    obtain  obtaining certificate   {"identifier": "example.com"}
1.6813584326396532e+09  info    waiting on internal rate limiter        {"identifiers": ["example.com"], "ca": "https://acme-v02.api.letsencrypt.org/directory", "account": "admin@example.com"}
1.6813584326396782e+09  info    done waiting on internal rate limiter   {"identifiers": ["example.com"], "ca": "https://acme-v02.api.letsencrypt.org/directory", "account": "admin@example.com"}
1.6813584339377418e+09  info    acme_client     trying to solve challenge       {"identifier": "example.com", "challenge_type": "dns-01", "ca": "https://acme-v02.api.letsencrypt.org/directory"}
1.6813584339743567e+09  error   acme_client     cleaning up solver      {"identifier": "example.com", "challenge_type": "dns-01", "error": "no memory of presenting a DNS record for "_acme-challenge.example.com" (usually OK if presenting also failed)"}
1.6813584343696542e+09  error   obtain  could not get certificate from issuer   {"identifier": "example.com", "issuer": "acme-v02.api.letsencrypt.org-directory", "error": "[example.com] solving challenges: presenting for challenge: expected one record, got 2: [{ TXT  gzMAhE4kXxD-I1AtOgZXPFzPYETwu2AK4QZ73_EcSuQ 0s 0} { TXT  n5szy1XB50jmsvzll0FrqQM8NkxptcKcTpRA4kF6UqM 0s 0}] (order=https://acme-v02.api.letsencrypt.org/acme/order/1052573887/175858936827) (ca=https://acme-v02.api.letsencrypt.org/directory)"}
1.6813584343696938e+09  info    obtain  releasing lock  {"identifier": "example.com"}
[ERR] Could not manage certmagic certs: example.com: obtaining certificate: [example.com] Obtain: [example.com] solving challenges: presenting for challenge: expected one record, got 2: [{ TXT  gzMAhE4kXxD-I1AtOgZXPFzPYETwu2AK4QZ73_EcSuQ 0s 0} { TXT  n5szy1XB50jmsvzll0FrqQM8NkxptcKcTpRA4kF6UqM 0s 0}] (order=https://acme-v02.api.letsencrypt.org/acme/order/1052573887/175858936827) (ca=https://acme-v02.api.letsencrypt.org/directory)
[INF] Successfully Created SSL Certificate at: /root/.local/share/certmagic

After fixed:

[INF] Requesting SSL Certificate for:  [*.example.com, example.com]
1.6813639810621955e+09  info    maintenance     started background certificate maintenance      {"cache": "0xc000321d50"}
1.6813639810622997e+09  info    obtain  acquiring lock  {"identifier": "*.example.com"}
1.6813639810661092e+09  info    obtain  lock acquired   {"identifier": "*.example.com"}
1.681363981066241e+09   info    obtain  obtaining certificate   {"identifier": "*.example.com"}
1.68136398404343e+09    info    waiting on internal rate limiter        {"identifiers": ["*.example.com"], "ca": "https://acme-v02.api.letsencrypt.org/directory", "account": "admin@example.com"}
1.681363984043484e+09   info    done waiting on internal rate limiter   {"identifiers": ["*.example.com"], "ca": "https://acme-v02.api.letsencrypt.org/directory", "account": "admin@example.com"}
1.6813639848616865e+09  info    acme_client     trying to solve challenge       {"identifier": "*.example.com", "challenge_type": "dns-01", "ca": "https://acme-v02.api.letsencrypt.org/directory"}
1.6813639943998172e+09  error   acme_client     cleaning up solver      {"identifier": "*.example.com", "challenge_type": "dns-01", "error": "no memory of presenting a DNS record for "_acme-challenge.example.com" (usually OK if presenting also failed)"}
1.6813639943998632e+09  info    acme_client     authorization finalized {"identifier": "*.example.com", "authz_status": "valid"}
1.6813639943998742e+09  info    acme_client     validations succeeded; finalizing order {"order": "https://acme-v02.api.letsencrypt.org/acme/order/1057453247/175872552917"}
1.6813639959146342e+09  info    acme_client     successfully downloaded available certificate chains    {"count": 2, "first_url": "https://acme-v02.api.letsencrypt.org/acme/cert/03841b99f6639aabe0e06832a52a4da308b4"}
1.6813639959150116e+09  info    obtain  certificate obtained successfully       {"identifier": "*.example.com"}
1.6813639959150426e+09  info    obtain  releasing lock  {"identifier": "*.example.com"}
1.6813639982304623e+09  info    obtain  acquiring lock  {"identifier": "example.com"}
1.6813639982319372e+09  info    obtain  lock acquired   {"identifier": "example.com"}
1.6813639982320085e+09  info    obtain  obtaining certificate   {"identifier": "example.com"}
1.6813639982323582e+09  info    waiting on internal rate limiter        {"identifiers": ["example.com"], "ca": "https://acme-v02.api.letsencrypt.org/directory", "account": "admin@example.com"}
1.681363998232381e+09   info    done waiting on internal rate limiter   {"identifiers": ["example.com"], "ca": "https://acme-v02.api.letsencrypt.org/directory", "account": "admin@example.com"}
1.6813639994403853e+09  info    acme_client     trying to solve challenge       {"identifier": "example.com", "challenge_type": "dns-01", "ca": "https://acme-v02.api.letsencrypt.org/directory"}
1.6813640172283795e+09  error   acme_client     cleaning up solver      {"identifier": "example.com", "challenge_type": "dns-01", "error": "no memory of presenting a DNS record for "_acme-challenge.example.com" (usually OK if presenting also failed)"}
1.6813640172284114e+09  info    acme_client     authorization finalized {"identifier": "example.com", "authz_status": "valid"}
1.681364017228428e+09   info    acme_client     validations succeeded; finalizing order {"order": "https://acme-v02.api.letsencrypt.org/acme/order/1057453247/175872590317"}
1.6813640186577752e+09  info    acme_client     successfully downloaded available certificate chains    {"count": 2, "first_url": "https://acme-v02.api.letsencrypt.org/acme/cert/03d30963c61b3a10a5b388c3568f8c6d1ef0"}
1.6813640186581326e+09  info    obtain  certificate obtained successfully       {"identifier": "example.com"}
1.6813640186581633e+09  info    obtain  releasing lock  {"identifier": "example.com"}
[INF] Successfully Created SSL Certificate at: /root/.local/share/certmagic