ci(test): add support for automated testing

[m4heshd]

I felt like this was a necessary addition that will help in the process of keeping mums around the world happy. Especially since people seem to be contributing a lot to this awesome project.

Features:

• Automatically tests pushes, pull requests and manual dispatches
• Tests on all major platforms

Mum ❤👩🏻.

[tsivinsky]

oh, thank you.