chore(build): activate GitHub workflow for PRs

[cdcabrera]

What's included

• chore(build): activate GitHub workflow for PRs

Notes

• Once this is merged it is important that we disable the "pull request" Travis checks. If we need to back this workflow out we can simply reactivate the Travis "pull request" check and remove the workflow
  • Possible, appears we may need to leave the "pull request" Travis check running until this change is merged all the way up. However, we can make Travis "NOT required" on any branch where the GitHub workflow is. Travis will run, just as an add on until it can be worked completely out.

Why?

Running unit tests in Travis seems to be getting increasingly slower with each new test. This is an attempt to remove Pull Requests from Travis and move those confirmations into GitHub.

We will still be using the same Travis scripts to compile the GUI, and push to the curiosity-frontend-build repo, which in turn pushes to the Platform environments. This includes the exact same scripts as the GitHub workflow... Travis is just slower

How to test

Once this is merged

1. rebase your PR against the CI branch
2. open a PR against CI, there should be a "checks" tab on GitHub PRs
   
3. the new workflow should be visible as "Pull request"

Example

...

Updates issue/story

Ongoing and #275
PRs - #436 #435 #434

[codecov-commenter]

Codecov Report

Merging #427 into ci will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##               ci     #427   +/-   ##
=======================================
  Coverage   92.71%   92.71%           
=======================================
  Files          69       69           
  Lines        1716     1716           
  Branches      392      392           
=======================================
  Hits         1591     1591           
  Misses        110      110           
  Partials       15       15           

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