fixed cache janitor logic

[Code-Hex]

Close #20

This PR makes a new janitor logic with a context package. based on #22

[codecov]

Codecov Report

Merging #23 (04fe7d7) into main (18d286f) will decrease coverage by 0.86%.
The diff coverage is 64.91%.

❗ Current head 04fe7d7 differs from pull request most recent head 5463ae1. Consider uploading reports for the commit 5463ae1 to get more accurate results

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   96.50%   95.64%   -0.87%     
==========================================
  Files           8        9       +1     
  Lines         515      528      +13     
==========================================
+ Hits          497      505       +8     
- Misses         17       23       +6     
+ Partials        1        0       -1     

Impacted Files	Coverage Δ
cache.go	82.57% <44.44%> (-4.57%)	⬇️
janitor.go	100.00% <100.00%> (ø)

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