feat(argocd-applicationset): Add resources metrics-service and servicemonitor. (#1041)

* [argocd-applicationset]: Add metrics-service and servicemonitor to applicationset.

Signed-off-by: fuyuan.chu <fuyuan.chu@airwallex.com>

* [argocd-applicationset]: Add ci values for servicemonitor.

Signed-off-by: fuyuan.chu <fuyuan.chu@airwallex.com>

* format indent

Signed-off-by: fuyuan.chu <fuyuan.chu@airwallex.com>

* update helm docs

Signed-off-by: fuyuan.chu <fuyuan.chu@airwallex.com>

* update ci values

Signed-off-by: fuyuan.chu <fuyuan.chu@airwallex.com>

* update ci values

Signed-off-by: fuyuan.chu <fuyuan.chu@airwallex.com>

* chore: Use consistent indents and file ending

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

* Also disable mounts of ArgoCD during metrics test

Signed-off-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

Co-authored-by: Marco Kilchhofer <mkilchhofer@users.noreply.github.com>

charts/argocd-applicationset/templates/metrics-service.yaml

@@ -0,0 +1,25 @@
+{{- if .Values.metrics.enabled }}
+apiVersion: v1
+kind: Service
+metadata:
+  {{- if .Values.metrics.service.annotations }}
+  annotations:
+    {{- range $key, $value := .Values.metrics.service.annotations }}
+    {{ $key }}: {{ $value | quote }}
+    {{- end }}
+  {{- end }}
+  labels:
+    {{- include "argo-applicationset.labels" . | nindent 4 }}
+    {{- with .Values.metrics.service.labels }}
+      {{- toYaml . | nindent 4 }}
+    {{- end }}
+  name: {{ template "argo-applicationset.fullname" . }}-metrics
+spec:
+  ports:
+  - name: metrics
+    protocol: TCP
+    port: {{ .Values.metrics.service.servicePort }}
+    targetPort: metrics
+  selector:
+    {{- include "argo-applicationset.selectorLabels" . | nindent 4 }}
+{{- end }}