Add Github Actions support

[ibrahim0814]

Purpose

Currently there's no way for the node uploader to detect Actions CI/CD pipelines. This PR adds support for it.

Note: There's currently no way to obtain a build_url or build number from the Actions environment variables. That's why they've been excluded in this PR.

[ibrahim0814]

@eddiemoore Do you know why these tests are failing? I can't really tell why from the output on Travis

[eddiemoore]

Sorry it's taken me so long to review this because of my current work.

[codecov]

Codecov Report

Merging #160 into master will increase coverage by 0.46%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #160      +/-   ##
==========================================
+ Coverage   83.78%   84.25%   +0.46%     
==========================================
  Files          22       23       +1     
  Lines         370      381      +11     
  Branches       92       95       +3     
==========================================
+ Hits          310      321      +11     
  Misses         49       49              
  Partials       11       11              

Impacted Files	Coverage Δ
lib/detect.js	92.30% <ø> (ø)
lib/services/github_actions.js	100.00% <100.00%> (ø)

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[ibrahim0814]

@eddiemoore No worries! Fixed the jest assertions and Travis is now passing.

[ibrahim0814]

Corrected the service name!

[JustinBeckwith]

Greetings folks! This is a change that would make our lives much easier :) Anything I can do to help it get merged?

[ibrahim0814]

Accidentally closed this PR, sorry about that. @eddiemoore, is this ready to merge?

[thomasrockhu]

As always, thanks @ibrahim0814