Add GH Actions PR checks

[Weetbix]

This PR adds the usual PR quality checks.

• Code quality
  • Runs eslint. Fails for now because we have not fixed the lint issues
• Tests + Coverage
  • Comments on its own PRs with its own action 😎
• Build
  • Runs build to ensure the build is successful
  • Checks that the committed dist has no differences to the one it build during CI. This allows us to ensure that you ran build and committed the dist file locally.
  • In the future we can discuss how the build dist file should be, and if it should be moved into CI only instead of being committed. But at this point it makes the PRs a bit safer :)

Changes:

• Had to delete and recreate the yarn lock file, as tests were failing to run with the previously resolved tree
• Ignored the dist file in prettier ignore
• Updated the jest test file name config. Forgot to do this in the ESLint PR so tests were not picked up
• Updated the dist, as there are changes due to the lock file changes

[github-actions]

Coverage after merging jh/add-gh-action-check-to-pr into master

100.00%

Coverage Report

File	Branches	Funcs	Lines	Uncovered Lines
src
html.js	100%	100%	100%
lcov.js	100%	100%	100%
tabulate.js	100%	100%	100%

[eeshdarthvader]

Awesome stuff 🔥