fix(k8s): update label to use recommended format

Replace the app label with the app.kubernetes.io/name 
format in the deployment configuration to follow best 
practices for Kubernetes labeling conventions. This 
ensures better compatibility with tooling and promotes 
standardization across deployments.

k8s/deploy.yaml

@@ -2,7 +2,7 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   labels:
-    app: geo-service
+    app.kubernetes.io/name: geo-service
   name: geo-service
   annotations:
     kubernetes.io/change-cause: "${TIMESTAMP} Deployed commit id: ${COMMIT}"
@@ -10,7 +10,7 @@ spec:
   replicas: 1
   selector:
     matchLabels:
-      app: geo-service
+      app.kubernetes.io/name: geo-service
   strategy:
     rollingUpdate:
       maxSurge: 1
@@ -19,7 +19,7 @@ spec:
   template:
     metadata:
       labels:
-        app: geo-service
+        app.kubernetes.io/name: geo-service
     spec:
       affinity:
         podAntiAffinity:
@@ -28,7 +28,7 @@ spec:
               podAffinityTerm:
                 labelSelector:
                   matchExpressions:
-                    - key: "app"
+                    - key: "app.kubernetes.io/name"
                       operator: In
                       values:
                         - geo-service
@@ -61,5 +61,5 @@ spec:
       protocol: TCP
       targetPort: 80
   selector:
-    app: geo-service
+    app.kubernetes.io/name: geo-service
   type: ClusterIP