🚚(helm) add posthog proxy

To contourn ads blocker, we add a proxy to the
posthog service. This way, we can access the
service from the same domain as the frontend.

docs/examples/impress.values.yaml

@@ -40,6 +40,7 @@ backend:
     LOGIN_REDIRECT_URL: https://impress.127.0.0.1.nip.io
     LOGIN_REDIRECT_URL_FAILURE: https://impress.127.0.0.1.nip.io
     LOGOUT_REDIRECT_URL: https://impress.127.0.0.1.nip.io
+    POSTHOG_KEY: "{'id': 'posthog_key', 'host': 'https://product.impress.127.0.0.1.nip.io'}"
     DB_HOST: postgresql
     DB_NAME: impress
     DB_USER: dinum
@@ -121,6 +122,12 @@ yProvider:
     COLLABORATION_SERVER_SECRET: my-secret
     Y_PROVIDER_API_KEY: my-secret
 
+posthog:
+  ingress:
+    enabled: false
+  ingressAssets:
+    enabled: false
+
 ingress:
   enabled: true
   host: impress.127.0.0.1.nip.io