[enhancement]: Support Google Trust Services ACME provider

[hozansahin]

Which feature or improvement would you like to request?

I'd like to see this feature:
TLS-DNS-01 support had already arrived. and letsencrypt ACME provider is currently only available, I suggest adding Google Google Trust Services as an alternative

some sources:
https://pki.goog/
https://pki.goog/repository/
https://cloud.google.com/certificate-manager/docs/public-ca-tutorial

Is your feature request related to a problem?

not really a problem, but it would be good to add them as alternatives

Code of Conduct

• I agree to follow this project's Code of Conduct

[mdecimus]

Stalwart supports any providers that implement ACME, this could be either Let's Encrypt or ZeroSSL for instance.
Have you tried using Google Trust Services with Stalwart? You just need to enter their directory URL and if they support ACME it should work.

[hozansahin]

Stalwart supports any providers that implement ACME, this could be either Let's Encrypt or ZeroSSL for instance. Have you tried using Google Trust Services with Stalwart? You just need to enter their directory URL and if they support ACME it should work.

Actually, I wanted to try it, but I didn't use it because it doesn't have a structure suitable for this, that is, I don't know where to put the following
environment variables.

EAB_KID: the EAB key ID
EAB_HMAC_KEY: the EAB HMAC key

[williamdes]

I agree with the reporter, for ZeroSSL the two envs are required. That said I am unsure if it's more about adding another provider or not
AWS DNS would also require credentials

[mdecimus]

It won't be necessary to add a new provider type, only support for EAB is required.