Dockerize for development

[morse255]

This PR modifies the script/setup and script/test scripts so that a Docker container is used instead of the local development environment. It adds a script/docker script to make it easy to start a bash shell inside the Docker container.

A few additional notes:

• The DaemonKit and Capistrano related scripts no longer work with these changes. I am intentionally keeping this change out of the main branch because of that. Both of those dependencies will be removed in future PRs to the containerization branch.

• The Dockerfile was constructed as a multistage build because this same Dockerfile will be used in our production deployment. Having multiple stages will allow us to integrate the production target more easily in a future PR.

• There is a single compose.yaml in this project instead of our typical docker-compose.arm64.yml and docker-compose.x86.yml. Because this project has no container dependencies, there was no need for architecture specific Docker Compose configurations.

• There is no linter included in this change. I will add reek/standard in a subsequent PR.

[morse255]

Non-blocking and nit-picky, but why .yaml rather than .yml? Either work, we've just used .yml historically.

I chose compose.yaml here because it is the (new-ish) preferred naming convention according to the Docker Compose documentation: https://docs.docker.com/compose/intro/compose-application-model/#the-compose-file