Their Dockerfiles include things like download pre built binaries from $SECRET_BASEURL which is hosted by them, can still be found in git log though. I imagine it will go offline / have auth soon enough.
I use it for other things and it performs admirably. (In particularly my Sony camera has trouble with cheap cables) It is one of two "elite" USB-C cables I keep near my computer, the other one is the shorter cable that came with the Looking Glass Go.
> Let’s Encrypt follows the DNS standards when looking up TXT records for DNS-01 validation, you can use CNAME records or NS records to delegate answering the challenge to other DNS zones. This can be used to delegate the _acme-challenge subdomain to a validation-specific server or zone. It can also be used if your DNS provider is slow to update, and you want to delegate to a quicker-updating server.
