feat: add support of Uptime Kuma

[favonia]

This reverts commit c267f94. Close #599.

[codecov]

Codecov Report

Merging #600 (d498a39) into main (a5a4504) will increase coverage by 0.33%.
The diff coverage is 95.95%.

❗ Current head d498a39 differs from pull request most recent head ef5d2da. Consider uploading reports for the commit ef5d2da to get more accurate results

@@            Coverage Diff             @@
##             main     #600      +/-   ##
==========================================
+ Coverage   87.96%   88.30%   +0.33%     
==========================================
  Files          44       45       +1     
  Lines        2202     2300      +98     
==========================================
+ Hits         1937     2031      +94     
- Misses        256      259       +3     
- Partials        9       10       +1     

Flag	Coverage Δ
unittests	88.30% <95.95%> (+0.33%)	⬆️

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Files	Coverage Δ
internal/config/config_read.go	100.00% <100.00%> (ø)
internal/config/env_monitor.go	100.00% <100.00%> (ø)
internal/monitor/updatekuma.go	95.29% <95.29%> (ø)

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