[FEAT] Implement part3

[LeaYeh]

how to test:

# Install docker in the host VM
./scripts/setup_host.sh

cd p3
make

On the console output you can find the argocd & app URL, and the admin password

After login as admin you can see the application:

To visit the app website by http but not https:

To change the dev/kustomization.yaml and git commit && git push, you should see the app website should change:

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
resources:
  - deployment.yaml
  - service.yaml
images:
  - name: wil42/playground
    newTag: v1