enabling mTLS for gitlab

chart/templates/peerauthentications/metrics-exception.yaml

+{{ if .Values.istio.enabled }}
+apiVersion: security.istio.io/v1beta1
+kind: PeerAuthentication
+metadata:
+  name: gitlab-metrics-exception
+  namespace: {{ .Release.Namespace }}
+spec:
+  mtls:
+    mode: {{ .Values.istio.mtls.mode }}
+  selector:
+    matchLabels:
+      app: gitlab-exporter
+  portLevelMtls:
+    "9168":
+      mode: PERMISSIVE
+{{- end }}
+---
+# metrics for gitlab but only when gitlab runner is enabled
+{{ if .Values.istio.enabled }}
+apiVersion: security.istio.io/v1beta1
+kind: PeerAuthentication
+metadata:
+  name: gitlab-metrics-runner-exception
+  namespace: {{ .Release.Namespace }}
+spec:
+  mtls:
+    mode: {{ .Values.istio.mtls.mode }}
+  selector:
+    matchLabels:
+      app: gitlab-runner-gitlab-runner
+  portLevelMtls:
+    "9252":
+      mode: PERMISSIVE
+{{- end }}
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