FLEXY-4848: use Github actions

[sanjeet-tw]

FLEXY-4848: Migration build to Github Actions

Contributing to Twilio

All third-party contributors acknowledge that any contributions they provide will be made under the same open-source license that the open-source project is provided under.

• I acknowledge that all my contributions will be made under the project's license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (84032af) 89.64% compared to head (42bbd99) 89.64%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #851   +/-   ##
=======================================
  Coverage   89.64%   89.64%           
=======================================
  Files         140      140           
  Lines       13438    13438           
  Branches     1014     1014           
=======================================
  Hits        12046    12046           
  Misses       1377     1377           
  Partials       15       15           

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