Configure wildcard TLS certificate

[cbj4074]

Currently, the various domains use individual TLS certificates, which are cumbersome to renew (only because Let's Encrypt's automated renewal process is not without points of failure).

Overall, maintaining a single wildcard certificate will require less work and carry a lower risk of failure.

[cbj4074]

Actually, my initial assumption may be false.

Apparently, wildcard certificates are not trivial to maintain because they require authentication via the DNS-01 challenge type, which means that in order to fully-automate their renewal, it's necessary to be able to update the relevant DNS records programatically.

More info in the Wildcard Support announcement:

https://community.letsencrypt.org/t/acme-v2-and-wildcard-certificate-support-is-live/55579

Additionally, there are risks associated with configuration automated TXT record updates at the DNS provider, which are detailed in one of the replies to this how-to thread:

https://community.letsencrypt.org/t/wildcard-domain-step-by-step/58250/4

I suppose we'll need to meditate on this a bit before taking action, but either way, the renewal process, from our end, needs to be made more or less bulletproof.