Sync ACME account registration #293
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This implements a distributed lock around registering new ACME accounts. I am not sure why this issue hasn't really appeared before, whether a recent change exposed this bug that we've always had, or we recently introduced this bug:
https://caddy.community/t/lets-encrypt-hits-rate-limit-too-many-registrations-for-this-ip/24343
Hoping this will tame things a bit. Makes sense in my head.