Health endpoint

[TheTeaCat]

• Implements calling a health endpoint if it's set in env
• Adds some logs of env vars to aid debugging in customer environments
• Adds log just before request is made to FireTail to aid debugging

[codecov]

Codecov Report

Attention: Patch coverage is 35.00000% with 13 lines in your changes missing coverage. Please review.

Project coverage is 83.63%. Comparing base (fe8fdaf) to head (8ff4a29).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
main.go	36.84%	11 Missing and 1 partial ⚠️
firetail/record_receiver.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
- Coverage   85.49%   83.63%   -1.86%     
==========================================
  Files          18       18              
  Lines         586      599      +13     
==========================================
  Hits          501      501              
- Misses         70       82      +12     
- Partials       15       16       +1     

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