feat: add crl support

[nothinux]

Create an empty CRL during CA creation

[codecov-commenter]

Codecov Report

Merging #13 (6f96252) into master (74c5bbe) will decrease coverage by 0.90%.
The diff coverage is 77.41%.

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@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
- Coverage   73.10%   72.20%   -0.90%     
==========================================
  Files           6        7       +1     
  Lines         792      842      +50     
==========================================
+ Hits          579      608      +29     
- Misses        172      188      +16     
- Partials       41       46       +5     

Files Changed	Coverage Δ
cmd/certify/main.go	59.03% <ø> (ø)
cmd/certify/command.go	70.07% <50.00%> (-0.76%)	⬇️
crl.go	60.86% <60.86%> (ø)
cmd/certify/helper.go	84.32% <95.65%> (-1.65%)	⬇️
certify.go	86.36% <100.00%> (+0.38%)	⬆️