Gleam: Compile Docker image and Linux binary on GitHub actions when a new release is created

[lpil]

https://help.github.com/en/github/automating-your-workflow-with-github-actions/events-that-trigger-workflows#release-event-release

[stefanluptak]

Assign to me please. 🙏

[stefanluptak]

I am not a Docker expert, but before calling docker push, we'll need to do docker login, I guess. Could you please provide me with command we'll use to login? I assume there will be some token used. You need to save this token into secrets. And then tell me the name of the secret, so I can access it from the workflow.

[lpil]

Let's hold off pushing the image for now and just store the binary on the release. I wish to re-work the docker image and repo.