GitOps environment promotion / image version updates

procedure.txt

### BEFORE:

lmaly@localhost  ~/Projects/gitops-environment-promotion/envs/staging-asia   main  cat kustomization.yml
---
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
                         
namespace: staging
namePrefix: staging-asia-                                                        
                         
resources:     
- ../../base                                                                                                                                                                                                                                                          
                                                         
components:            
  - ../../variants/non-prod                                   
  - ../../variants/asia
                         
patchesStrategicMerge:
- deployment.yml             
- version.yml 
- replicas.yml   
- settings.yml

lmaly@localhost  ~/Projects/gitops-environment-promotion/envs/staging-asia   main  cat version.yml
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: simple-deployment
spec:
  template:
    spec:
      containers:
      - name: webserver-simple
        image: docker.io/kostiscodefresh/simple-env-app:2.0

### AFTER `kustomize edit set image docker.io/kostiscodefresh/simple-env-app:3.0`

lmaly@localhost  ~/Projects/gitops-environment-promotion/envs/staging-asia   main ±  cat kustomization.yml
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

namespace: staging
namePrefix: staging-asia-

resources:
- ../../base

components:
- ../../variants/non-prod
- ../../variants/asia

patchesStrategicMerge:
- deployment.yml
- version.yml
- replicas.yml
- settings.yml
images:
- name: docker.io/kostiscodefresh/simple-env-app
  newTag: "3.0"

lmaly@localhost  ~/Projects/gitops-environment-promotion/envs/staging-asia   main ±  cat version.yml
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: simple-deployment
spec:
  template:
    spec:
      containers:
      - name: webserver-simple
        image: docker.io/kostiscodefresh/simple-env-app:2.0

### PROOF
lmaly@localhost  ~/Projects/gitops-environment-promotion/envs/staging-asia   main ±  kustomize build . | grep docker.io
image: docker.io/kostiscodefresh/simple-env-app:3.0