Migrate to GitHub Actions or GitLab CI

[xenago]

Currently there is a Travis CI file, but I prefer GitLab for OSS CI deployment.

• Determine if GitHub Actions is viable for CI - if so, just do it here
• Otherwise run on personal GitLab CI

Once decision is made, determine if it still builds and if this is a good starting point.

[xenago]

GitHub Docs - Quickstart for GitHub Actions

GitHub Docs - Migrating from Travis CI to GitHub Actions

[xenago]

Migrated to GitHub actions.