Use GitHub actions instead of Travis CI

[christianvuerings]

Description

Use GitHub actions instead of Travis CI to run:

• integration tests
• unit tests
• lint
• audit

Background

Travis CI shut down their free tier for open-source projects and the previous runs are no longer available on travis-ci.com:

https://www.travis-ci.com/welldone-software/why-did-you-render

Notes

• We will need to enable GitHub actions to run on welldone-software/why-did-you-render
• For now you can check https://github.com/christianvuerings/why-did-you-render/actions/runs/10773298913 to see the latest successful run

[christianvuerings]

@vzaidman do you have time to take a look?

[vzaidman]

Thank you for your contribution!