Add multi-auth devenv (#57609)

* add authentik devenv

* remove direct dependency on spew

* use cn

* add authentik instructions

* add backup instructions

pkg/models/user_auth.go

@@ -1,6 +1,7 @@
 package models
 
 import (
+	"fmt"
 	"time"
 
 	"github.com/grafana/grafana/pkg/services/org"
@@ -37,6 +38,10 @@ type ExternalUserInfo struct {
 	IsDisabled     bool
 }
 
+func (e *ExternalUserInfo) String() string {
+	return fmt.Sprintf("%+v", *e)
+}
+
 type LoginInfo struct {
 	AuthModule    string
 	User          *user.User