ci: add github actions workflow

[nihalgonsalves]

ci: add GitHub actions workflow

Description

Adds a workflow so that tests are run automatically.

Type of change

Build

How Has This Been Tested?

You can see the test run on my fork: https://github.com/nihalgonsalves/eslint-plugin-tailwindcss/actions/runs/7356169530/job/20025897805

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings