issues/324: When an acme challenge request is malformed, fail the request

[komuw]

• Updates: https://github.com/komuw/ong/issues/324

[codecov-commenter]

Codecov Report

Patch coverage: 8.00% and project coverage change: -0.22 :warning:

Comparison is base (850e1da) 74.41% compared to head (5fa4e7b) 74.19%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #326 +/- ## ========================================== - Coverage 74.41% 74.19% -0.22% ========================================== Files 43 43 Lines 4878 4891 +13 ========================================== - Hits 3630 3629 -1 - Misses 1002 1016 +14 Partials 246 246 ``` | [Impacted Files](https://app.codecov.io/gh/komuw/ong/pull/326?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu) | Coverage Δ | | |---|---|---| | [internal/acme/acme.go](https://app.codecov.io/gh/komuw/ong/pull/326?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-aW50ZXJuYWwvYWNtZS9hY21lLmdv) | `64.13% <8.00%> (-2.96%)` | :arrow_down: |

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