issues/296: Fix bug where acme certificates were not cached in memory

[komuw]

• Before(due to a feature misuse bug), certificates would be fetched from disk for each request.

• Fixes: ong/acme: certs from memory dont seem to work. #296

[codecov-commenter]

Codecov Report

Patch coverage: 85.71% and project coverage change: +0.08 🎉

Comparison is base (e4c4d8f) 73.64% compared to head (3f848c6) 73.73%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #304      +/-   ##
==========================================
+ Coverage   73.64%   73.73%   +0.08%     
==========================================
  Files          42       42              
  Lines        4799     4804       +5     
==========================================
+ Hits         3534     3542       +8     
+ Misses       1015     1011       -4     
- Partials      250      251       +1     

Impacted Files	Coverage Δ
internal/acme/acme.go	62.41% <ø> (-0.69%)	⬇️
server/tls_conf.go	57.53% <85.71%> (+10.47%)	⬆️

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