Merge branch 'opa-bump' into 'master'

allowedHostFilesystem For Prometheus Exporter

Closes platform-one/big-bang/apps/core/policy#64

See merge request platform-one/big-bang/bigbang!712

chart/templates/gatekeeper/values.yaml

@@ -32,6 +32,14 @@ violations:  # Try to keep this in alpha order to make it easier to find keys
     {{- end }}
   {{- end }}
 
+  {{- if .Values.monitoring.enabled}}
+  allowedHostFilesystem:
+    match:
+      excludedNamespaces: 
+        # required for monitoring's prometheus-node-exporter to get node metrics
+        - monitoring
+  {{- end }}
+
   {{- if .Values.monitoring.enabled }}
   hostNetworking:
     match: