fix(k8s): standardize app label to app.kubernetes.io/name

Update Kubernetes YAML files to replace the app label with the 
standard app.kubernetes.io/name label for better consistency 
and adherence to best practices in Kubernetes resource labeling.

k8s/deploy.yaml

@@ -7,7 +7,7 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   labels:
-    app: schemas
+    app.kubernetes.io/name: schemas
   name: schemas
   annotations:
     kubernetes.io/change-cause: "${TIMESTAMP} Deployed commit id: ${COMMIT}"
@@ -15,7 +15,7 @@ spec:
   replicas: 1
   selector:
     matchLabels:
-      app: schemas
+      app.kubernetes.io/name: schemas
   strategy:
     rollingUpdate:
       maxSurge: 1
@@ -24,7 +24,7 @@ spec:
   template:
     metadata:
       labels:
-        app: schemas
+        app.kubernetes.io/name: schemas
     spec:
       affinity:
         podAntiAffinity:
@@ -33,7 +33,7 @@ spec:
             podAffinityTerm:
               labelSelector:
                 matchExpressions:
-                - key: "app"
+                - key: "app.kubernetes.io/name"
                   operator: In
                   values:
                   - schemas
@@ -79,5 +79,5 @@ spec:
     protocol: TCP
     targetPort: 8080
   selector:
-    app: schemas
+    app.kubernetes.io/name: schemas
   type: NodePort