ci: migrate to GitHub Actions w/ matrix

[agilgur5]

Summary

Migrate from Travis CI to GitHub Actions plus add a testing matrix

Details

• Travis CI is only pseudo-free after the .org -> .com merge

  • c.f. https://github.com/docopt/docopts/issues/54, #69, https://github.com/agilgur5/react-signature-canvas/pull/64#issuecomment-1030886888
  • and honestly, has glitches occasionally where my builds don't run or I can't manually re-run either -- #83 not running any CI was kind of the straw that broke the camel's back 😕
  • much respect to https://travis-ci.org, rest in peace

• GH Actions are actually free for OSS / public repos

  • and also offer a decent level of composability that's resulted in a huge surge in reusable community Actions (vs. CircleCI orbs etc haven't had nearly as much adoption)
  • and I've had a mostly great experience on them so far as well

• also add a matrix for all Node LTS and all OSes

• and upgrade to the Codecov GH Action, since the bash uploader was deprecated

• this is basically a mix of the Actions I helped set-up in rpt2's repo and the TSDX templates:

  • https://github.com/ezolenko/rollup-plugin-typescript2/blob/03cfb048adcf39de56bd4566dc9a7300534a3cc1/.github/workflows/nodejs.yml
  • https://github.com/jaredpalmer/tsdx/blob/2d7981b00b2bf7363a3eeff44ff5ff698ba58c8c/templates/basic/.github/workflows/main.yml
  • plus upgrades to all the Actions, for instance, newer setup-node now has caching built-in

[agilgur5]

Welp, Node 18 is having some issues installing node-canvas, seems to be an upstream issue: https://github.com/Automattic/node-canvas/issues/2025

Will remove Node 18 from the matrix for now then

[codecov[bot]]

Codecov Report

Merging #84 (6888bf2) into main (3db849f) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #84   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           75        75           
  Branches         9         9           
=========================================
  Hits            75        75           

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[agilgur5]

Changed the required checks for the main branch to use one of the GH Actions checks instead of the Travis CI check