fix: k8s metrics port declaration

Author: rtrompier

chart/templates/service.yaml

@@ -15,7 +15,7 @@ spec:
   - name: metrics
     port: {{ $.Values.envVars.METRICS_PORT | default 5565 | int }}
     protocol: TCP
-    targetPort: {{ $.Values.envVars.METRICS_PORT | default 5565 | quote }}
+    targetPort: metrics
   {{- end }}
   selector: {{ include "labels.standard" . | nindent 4 }}
   type: {{.Values.service.type}}