Resolve "Network Policies block plugin marketplace and update checks"

For issue #22 (closed)

chart/templates/bigbang/networkpolicies/egress-https.yaml

+{{- if and .Values.networkPolicies.enabled .Values.networkPolicies.egressHttps.enabled }}
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-https-egress
+  namespace: {{ .Release.Namespace }}
+spec:
+  policyTypes:
+  - Egress
+  egress:
+  - ports:
+    - port: 443
+      protocol: TCP
+  podSelector:
+    matchLabels:
+      app: sonarqube
+{{- end }}
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