[PR] Adds CI, upgrades dependencies and changes scope to fly.io

[LuchoTurtle]

fixes #7

This PR:

• adds CI workflows.
• updates the README with the new CI badge, generalizes the content with fly.io
• upgrades dependencies to fix ssl_verify_fun compile error when running on later versions of Elixir (see public_key.hrl header cannot be found elixir-lang/elixir#12681 (comment)).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (a59c40f) to head (5ba5acc).
Report is 4 commits behind head on main.

❗ Current head 5ba5acc differs from pull request most recent head b35acde. Consider uploading reports for the commit b35acde to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #8   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            1         1           
=========================================
  Hits             1         1           

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[LuchoTurtle]

@nelsonic please merge and publish so I can test in image-classifier. I need this dependency upgrade because the version solving fails when I try to add it to the image-classifier repository.

[nelsonic]

@LuchoTurtle Thanks for making these improvements+updates. 🙏
Published as: https://hex.pm/packages/ping/2.0.0 📦 🚀