Replace TravisCI with GitHub Actions

[jmewes]

Due to the restrictions that where added to the open-source plan of TravisCI, it is better for this project to migrate the builds to GitHub Actions.

Also see:

• https://travis-ci.community/t/question-open-source-travis-ci-for-open-source-projects-as-of-august-2022/13233
• https://www.jeffgeerling.com/blog/2020/travis-cis-new-pricing-plan-threw-wrench-my-open-source-works

[jmewes]

Internal ticket number: EPNG-10282

[jmewes]

Version 0.18.2 was published from GitHub Actions and could be successfully included in a test project.