Setup CI

[Darrenla]

Add CI to run 3 steps:

- name: Build Docker image
  run: docker build -t interview-app .
- name: Run the container
  run: docker run -d -p 3000:3000 -v $(pwd):/rails --name interview-dev interview-app
- name: Run all tests
  run: docker container exec interview-dev ./bin/rails test

[hakimAtTripla]

Thank you @Darrenla !