Configuring the project for Fly.io

When it comes to deployment options, Fly.io is a flexible platform that offers multiple alternatives. There are integrations with several programming languages and frameworks, and quick start guides with detailed documentation on how to deploy applications based on each of these technologies. Most of these choices involve Fly.io performing a container image build from your application or project sources. In addition, there’s also the possibility to deploy a pre-built container image that is publicly available in Docker Hub. This is the most appropriate choice for our application’s requirements since it is based on multiple programming languages and none of the Fly.io suggested approaches would work for us.

In the Pushing the container image to Docker Hub section of Chapter 12, Deploying Your Application to Kubernetes, we pushed a container image of the task manager packaged for JVM mode to Docker Hub. You might be wondering, why not...