Set recommended kubernetes labels on services and workflows

Motivation:
There's a need to select efficiently workflows and their respective
services. Having the common kubernetes labels allow a single selector:

   podSelector:
     matchExpressions:
       - { key: app.kubernetes.io/component, operator: In, values:
         ["data-index-service", "jobs-service", "serverless-workflow"] }

Modification:
Make the v1.Deployment for services and the deployment or knative
services to contain at common labels

Result:
A workflow deployment or knative serving labels:
    app.kubernetes.io/name: ${workflow name}
    app.kubernetes.io/component: serverless-workflow
    app.kubernetes.io/part-of: ${platform url set by status}
    app.kubernetes.io/managed-by: sonataflow-operator

Data index or Jobs services Deployment.v1 labels:

    app.kubernetes.io/name: ${service name}
    app.kubernetes.io/component: data-index-service|jobs-service
    app.kubernetes.io/part-of: ${platform name}
    app.kubernetes.io/managed-by: sonataflow-operator

A future improvement will be to pass the platform name to the workflow
so app.kubernetes.io/part-of will have the platform name so we can
select all component for a platform.

Reference: https://kubernetes.io/docs/concepts/overview/working-with-objects/common-labels/#labels

Signed-off-by: Roy Golan <[email protected]>

controllers/platform/k8s.go

@@ -233,8 +233,12 @@ func createOrUpdateService(ctx context.Context, client client.Client, platform *
 
 func getLabels(platform *operatorapi.SonataFlowPlatform, psh services.PlatformServiceHandler) (map[string]string, map[string]string) {
 	lbl := map[string]string{
-		workflowproj.LabelApp:     platform.Name,
-		workflowproj.LabelService: psh.GetServiceName(),
+		workflowproj.LabelApp:          platform.Name,
+		workflowproj.LabelService:      psh.GetServiceName(),
+		"app.kubernetes.io/name":       psh.GetServiceName(),
+		"app.kubernetes.io/component":  psh.GetContainerName(),
+		"app.kubernetes.io/part-of":    platform.Name,
+		"app.kubernetes.io/managed-by": "sonataflow-operator",
 	}
 	selectorLbl := map[string]string{
 		workflowproj.LabelService: psh.GetServiceName(),

workflowproj/operator.go

@@ -85,8 +85,12 @@ func GetManagedPropertiesFileName(workflow *operatorapi.SonataFlow) string {
 // GetDefaultLabels gets the default labels based on the given workflow.
 func GetDefaultLabels(workflow *operatorapi.SonataFlow) map[string]string {
 	return map[string]string{
-		LabelApp:      workflow.Name,
-		LabelWorkflow: workflow.Name,
+		LabelApp:                       workflow.Name,
+		LabelWorkflow:                  workflow.Name,
+		"app.kubernetes.io/name":       workflow.Name,
+		"app.kubernetes.io/component":  "serverless-workflow",
+		"app.kubernetes.io/part-of":    workflow.Status.Services.DataIndexRef.Url,
+		"app.kubernetes.io/managed-by": "sonataflow-operator",
 	}
 }