memberships: run api service on a different port from ui (#118)

* memberships: run api service on different port

* memberships: add api service to chart

* installer: use membership api endpoint instead

---------

Co-authored-by: Giorgi Lekveishvili <lekva@gl-mbp-m1-max.local>
diff --git a/core/installer/app.go b/core/installer/app.go
index e91174a..8457fe2 100644
--- a/core/installer/app.go
+++ b/core/installer/app.go
@@ -188,7 +188,7 @@
 						upstream: "\(inp.serviceName).\(release.namespace).svc.cluster.local"
 						whoAmIAddr: "https://accounts.\(global.domain)/sessions/whoami"
 						loginAddr: "https://accounts-ui.\(global.domain)/login"
-						membershipAddr: "http://memberships.\(global.id)-core-auth-memberships.svc.cluster.local/api/user"
+						membershipAddr: "http://memberships-api.\(global.id)-core-auth-memberships.svc.cluster.local/api/user"
 						groups: inp.auth.groups
 						portName: _authProxyHTTPPortName
 					}