docker-powerdns
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Update to Alpine 3.10 and PowerDNS 4.2.1, plus minor refactoring
I've updated the base to Alpine 3.10 and PowerDNS 4.2.1, added a simple verification on downloaded tarball and improved readability (imho).
(this is my first PR ever, so I'm not sure on "best practices" or anything like that) Cheers!