feat(argo-cd): Add ability to create network policies (#800)

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

charts/argo-cd/templates/argocd-server/networkpolicy.yaml

@@ -0,0 +1,16 @@
+{{- if .Values.global.networkPolicy.create }}
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  labels:
+    {{- include "argo-cd.labels" (dict "context" . "component" .Values.server.name "name" .Values.server.name) | nindent 4 }}
+  name: {{ template "argo-cd.server.fullname" . }}
+spec:
+  ingress:
+  - {}
+  podSelector:
+    matchLabels:
+      {{- include "argo-cd.selectorLabels" (dict "context" . "name" .Values.server.name) | nindent 6 }}
+  policyTypes:
+  - Ingress
+{{- end }}