Migrate over to certmagic from using autocert #190
Merged
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This PR replaces the autocert package that was used for the HTTP api certificate handling with certmagic.
In addition to this, it changes the HTTP api certificate validation over to DNS challenge, which a acme-dns instance should always be able to fulfill, if it's not misconfigured in a way that would make it incapable of handling the issuance for its clients as well.
In broader sense, this means that acme-dns is finally able to acquire and configure HTTPS correctly regardless of being deployed without publicly accessible HTTP API.