Update k8s/overlays/internal/kustomization.yaml,...

Update k8s/overlays/internal/kustomization.yaml, k8s/overlays/production/kustomization.yaml, k8s/overlays/staging/kustomization.yml files

k8s/overlays/internal/kustomization.yaml

 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 namespace: ensembl-internal
+commonLabels:
+  environment: internal
 bases:
-  - ../../base
\ No newline at end of file
+  - ../../base

k8s/overlays/production/kustomization.yaml

 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 namespace: ensembl-prod
+commonLabels:
+  environment: production
 bases:
-  - ../../base
\ No newline at end of file
+  - ../../base

k8s/overlays/staging/kustomization.yml

@@ -4,4 +4,4 @@ namespace: ensembl-stage
 commonLabels:
   environment: staging
 bases:
-  - ../../base
\ No newline at end of file
+  - ../../base