Implement docker for development environment

[MattPereira]

Overview

We want to use docker to run our site locally so that the environment is more consistent for developers with different local environments.

Action Items

• [x] Create a Dockerfile with the necessary configuration to build an image to run our site
• [x] Create file named docker-compose.yml in root directory
• [x] Define the services necessary to containerize our application
• [x] Start dev env with docker compose up
• [x] Test that changes to code are still reflected on localhost

Resources

• https://docs.docker.com/develop/develop-images/dockerfile_best-practices/
• https://docs.docker.com/compose/
• https://hub.docker.com/_/ruby