Add commonLabels to Helm chart

Introduce `commonLabels` in the `values.yaml` file to allow users to add
custom labels to all resources created by the Helm chart. This enhancement
enables better categorization and management of resources by applying
consistent labeling throughout the deployment.

helm/trino-gateway/templates/_helpers.tpl

@@ -40,6 +40,9 @@ helm.sh/chart: {{ include "trino-gateway.chart" . }}
 app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
 {{- end }}
 app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- if .Values.commonLabels }}
+{{ tpl (toYaml .Values.commonLabels) . }}
+{{- end }}
 {{- end }}
 
 {{/*

helm/trino-gateway/values.yaml

@@ -54,6 +54,7 @@ config:
 
 service:
   type: ClusterIP
+  port: 8080
 
 ingress:
   enabled: false
@@ -110,6 +111,10 @@ tolerations: []
 
 affinity: {}
 
+# -- Labels that get applied to every resource's metadata
+commonLabels: {}
+  # example: "some label"
+
 podAnnotations: {}
 
 podLabels: {}