acme: add context cancellation

[komuw]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 90.47% and project coverage change: +0.04 🎉

Comparison is base (9ddad35) 74.11% compared to head (26f51c6) 74.16%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #314      +/-   ##
==========================================
+ Coverage   74.11%   74.16%   +0.04%     
==========================================
  Files          43       43              
  Lines        4849     4858       +9     
==========================================
+ Hits         3594     3603       +9     
  Misses       1008     1008              
  Partials      247      247              

Impacted Files	Coverage Δ
internal/acme/acme.go	66.77% <82.75%> (+1.97%)	⬆️
internal/acme/client.go	59.75% <96.55%> (ø)
internal/acme/helpers.go	65.29% <100.00%> (-1.12%)	⬇️
internal/acme/http_client.go	69.18% <100.00%> (ø)

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