Sync chart from pieced-threema-gateway 0.1.4

deploy/helm/pieced-threema-gateway/templates/networkpolicy.yaml

@@ -68,10 +68,17 @@ spec:
         - ports:
             - port: "443"
               protocol: TCP
-    # Postgres (same namespace)
+    # Postgres (same namespace).
+    #
+    # We match on the namespace label rather than `cnpg.io/cluster`
+    # because that CNPG label is not in Cilium's default identity-relevant
+    # label set in most installations — pods labelled that way still get a
+    # generic Cilium identity, so a matchLabels on it won't match anything.
+    # Restricting to port 5432 + same namespace is safe: the only thing
+    # listening on 5432 in this namespace is CNPG.
     - toEndpoints:
         - matchLabels:
-            "cnpg.io/cluster": "pieced-threema-gateway-db"
+            "k8s:io.kubernetes.pod.namespace": {{ .Values.namespace | quote }}
       toPorts:
         - ports:
             - port: "5432"