Setup K8s (minikube)

[iqbalpa]

This PR introduces Kubernetes support for the devtasker application, allowing it to be deployed and managed in a
Kubernetes cluster. The changes include adding Kubernetes configuration files, updating the docker-compose.yml file,
and modifying the README.md to include instructions for running the application with Minikube.

Changes:

• Added Kubernetes Configuration:
  • Added Kubernetes configuration files for all services (devtasker, nginx, postgres, grafana, prometheus) in the
    k8s/ directory.
  • These configurations were generated using kompose convert and then manually adjusted.
• Updated docker-compose.yml:
  • Exposed the PostgreSQL port to allow connections from outside the Docker network.
• Updated README.md:
  • Added a new section with instructions on how to run the application using Minikube.
  • Included details on how to access the application and other services.

How to Test:

1. Start Minikube:

minikube start

2. Apply the Kubernetes configurations:

kubectl apply -f k8s/

3. Access the application at http://[minikube-ip]:31000.