* acmeserver: support specifying the allowed challenge types
* add caddyfile adapt tests
* introduce basic acme_server test
* skip acme test on unsuitable environments
* skip integration tests of ACME
* documentation
* add negative-scenario test for mismatched allowed challenges
* a bit more docs
* fix tests for ACME challenges
* appease the linter
* skip ACME tests on s390x
* enable ACME challenge tests on all machines
* Apply suggestions from code review
Co-authored-by: Matt Holt <mholt@users.noreply.github.com>
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Co-authored-by: Matt Holt <mholt@users.noreply.github.com>
