feat: add healthchecks.io service

[rancoud]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 83.13253% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 87.76%. Comparing base (88d4b7c) to head (51524a5).

Files	Patch %	Lines
main.go	0.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
- Coverage   88.27%   87.76%   -0.52%     
==========================================
  Files           5        6       +1     
  Lines         580      662      +82     
==========================================
+ Hits          512      581      +69     
- Misses         65       78      +13     
  Partials        3        3              

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