Installer: use helm secrets to encrypt secrets locally and avoid regenerating them on every upgrade
diff --git a/charts/pihole/values.yaml b/charts/pihole/values.yaml
index 9c038d6..a7ced0b 100644
--- a/charts/pihole/values.yaml
+++ b/charts/pihole/values.yaml
@@ -1,6 +1,8 @@
 pihole: {}
 oauth2:
   clientId: app-pihole
+  clientSecret: ""
+  cookieSecret: ""
   secretName: oauth2-secret
   configName: oauth2-proxy
 domain: example.com