Deploy with GitHub Actions

[alysivji]

Since the move to Kubernetes, deployment is done using a manual helm upgrade. This is fine for now, but we should set it up in GitHub actions so it does not require me to be on my computer.

We can also use GitHub actions to create a Docker image and upload it to Docker Hub every time we cut a release. There is a Travis pipeline that does this currently -- no reason to move something that's already working.

[alysivji]

Spend some time removing Travis CI from this project. Workflow is exactly the same as before.

We will need to use GitHub to deploy

[alysivji]

Current deployment workflow: helm upgrade busybeaver-production ./busybeaver/ -f values/production.yaml --set image.version=[version]