Migrate from Travis CI to GitHub actions #21
Description
As GitHub Actions have become available more than a year ago, we would rather migrate our CI/CD workflow here and dismiss Travis CI.
- Add workflow to run unit tests on push (see Add github actions to execute tests on push and PRs against master #19)
- Add workflow to package CloudFormation template and upload artifacts to S3
We should probably also consider uploading the artifacts to more AWS regions… 🤔