Add GitHub Actions workflow for code checks

[InensusDev]

No description provided.

[dmohns]

This file is in the wrong location. Can you move it to .github/workflows/check.yml so it runs on this Pull Request and we can see some results?

[dmohns]

Right now we are adding a single job that runs all the linter. Could you split the build pipeline into multiple ones, one per linter?

For example, currently your CI yaml looks (a little simplified) like this:

jobs:
  build:
    - Lint ESLint JS
    - Lint ESLint Vue
    - Lint PHP
    - Run`npm build`    

Could you change it to be more like this:

jobs:
  lint-eslint-js:
    - Lint ESLint JS
  lint-eslint-vue:
    - Lint ESLint Vue
  lint-php:
    - Lint PHP
  build:
    - Run`npm build`    

This way they can all run in parallel and don't get blocked if one of them fails.