GH Action CI

[jtoar]

It would be amazing to have a RedwoodJS CI Action and publish it to GH Marketplace. The GH Action would:

• [x] diagnostic check
• [x] lint
• [x] build
• [x] test

[thedavidprice]

Also to consider adding would be Storybook CI! If there are story files, we can:

• [ ] at a minimum check build
• [ ] use Cypress or Puppeteer for e2e