Travis to workflows

[Codex-]

What did you implement:

I came across this issue which is blocking my usage of craco which now depends on cosmiconfig. I read that the PR won't be accepted until the travis-ci porting to Github Actions was completed, so this serves as a foundation to complete that.

How did you implement it:

I read the original travis-ci config and ported it to three workflows which separates the concerns:

• Build
  • Runs on supported LTS Node version, 12, 14, 16.
  • build
  • lint
  • test
• Coverage
  • Runs on LTS Node
  • test
• Release
  • Runs on LTS Node
  • build
  • semantic-release

How can we verify it:

Check the workflow runs, these can be re-run until things work.

Secrets need to be added for:

• SLACK_WEBHOOK (if you plan on using it, otherwise can just remove this).
• CC_TEST_REPORTER_ID for code climate coverage.
• Release things:
  • GITHUB_TOKEN
  • NPM_TOKEN

Releasing will be tricky to test with it being automatic and run on master only, due to the nature of secrets and such, I can't assist here (but would if I could).

Let me know what you think, and what you would like to change, I'm happy to try and facilitate these changes where I can.

Tasks:

• Write tests
• Write documentation
• Fix linting errors
• Make sure code coverage hasn't dropped
• Provide verification config / commands / resources
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[Codex-]

Unfortunately, it seems as though this repository and package aren't going to be maintained going forward, with the sale of Endemol Shine Group.

I have rewritten and addressed some existing issues (#134 #147 #155) and published a drop-in replacement:
https://www.npmjs.com/package/cosmiconfig-typescript-loader