Add basic health server

[sergicastro]

No description provided.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (dfd15f3) 89.37% compared to head (0bd8607) 89.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
- Coverage   89.37%   89.33%   -0.04%     
==========================================
  Files          15       16       +1     
  Lines        1045     1088      +43     
==========================================
+ Hits          934      972      +38     
- Misses         80       84       +4     
- Partials       31       32       +1     

Files	Coverage Δ
internal/config.go	97.82% <100.00%> (+0.04%)	⬆️
internal/logging.go	100.00% <ø> (ø)
internal/server/health.go	87.80% <87.80%> (ø)