issues/327: Bugfix, fetch certficate for subdomain beginning with number.

[komuw]

• Fixes: https://github.com/komuw/ong/issues/327

[codecov-commenter]

Codecov Report

Patch coverage: 85.71% and project coverage change: +0.86 :tada:

Comparison is base (38d7414) 74.11% compared to head (4696550) 74.98%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #328 +/- ## ========================================== + Coverage 74.11% 74.98% +0.86% ========================================== Files 43 43 Lines 4895 4897 +2 ========================================== + Hits 3628 3672 +44 + Misses 1021 983 -38 + Partials 246 242 -4 ``` | [Impacted Files](https://app.codecov.io/gh/komuw/ong/pull/328?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/328?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-aW50ZXJuYWwvYWNtZS9hY21lLmdv) | `75.07% <84.61%> (+11.90%)` | :arrow_up: | | [middleware/redirect.go](https://app.codecov.io/gh/komuw/ong/pull/328?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu#diff-bWlkZGxld2FyZS9yZWRpcmVjdC5nbw==) | `90.21% <100.00%> (-0.11%)` | :arrow_down: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/komuw/ong/pull/328/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Komu+Wairagu)

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