Backend docker file

[joshgamache]

Dev Story: I want a dockerfile for the backend because it will be needed to deploy to openshift and this will help me to run the application consistently locally and remote.

Acceptance criteria:

1. Dockerfile runs in local development

Consideration and notes

• See Chore: 30 backend dockerfile by Sepehr-Sobhani · Pull Request #71 · bcgov/cas-registration (github.com) for Cas-reg execution

Tasks

• [ ] Set up local backend docker file