Create Kubernetes deployment for backend

[ben8622]

We need to be able to deploy the backend to our GKE cluster, if we can do this locally (using docker desktop's built in kubernetes cluster) transferring it to the cloud should be relatively easy.

This relies on having a usable docker container first. I.E. you can ping the REST endpoints on your docker container.

You can see the frontend's example deployment.yml and service.yml in ./frontend/K8s/. It is important to note that whatever port's you are exposing through the container will have to reflect in the service.yml:

apiVersion: "v1"
kind: "Service"
metadata:
  name: "react-docker-service"
  namespace: "default"
spec:
  ports:
  - protocol: "TCP"
    port: 80
    targetPort: 80 ## THIS IS THE CONTAINER PORT I AM EXPOSING FOR FRONTEND ##
  selector:
    app: "react-docker"
  type: "LoadBalancer"
  loadBalancerIP: ""

I'm assuming this will be more complex than the frontend so please add any tutorials/comments you think may be relevant. For evidence attach screenshot of successful API requests to your cluster's external IP.