CI: add automated tests workflow

[joaoGabriel55]

No description provided.

[paulodiovani]

Prefer good written commits, with actual descriptions of what you've done. Even for small changes (e.g. "add `working-directory", "rename foo to bar").

If your commit is fixing a previous commit, you can use --amend to fix it up.

[paulodiovani]

Good work.

It would be nice to include a coverage report in the PR comments. There are a few options on the GitHub actions marketplace. Take a look at them when you have some free time and open a new PR adding your chosen one.