FEATURE: on initial boot hint users on how to get admin

config/environments/development.rb

@@ -45,5 +45,9 @@ Discourse::Application.configure do
 
   config.enable_anon_caching = false
   require 'rbtrace'
+
+  if emails = GlobalSetting.developer_emails
+    config.developer_emails = emails.split(",")
+  end
 end
 

config/initializers/06-ensure_login_hint.rb

@@ -0,0 +1,20 @@
+# Some sanity checking so we don't count on an unindexed column on boot
+if User.limit(20).count < 20 && User.where(admin: true).count == 1
+  notice =
+    if GlobalSetting.developer_emails.blank?
+      "No developer email addresses defined, logging in <a href='https://meta.discourse.org/t/how-to-create-an-administrator-account-after-install/14046'>will be tricky.</a>"
+    else
+      emails = GlobalSetting.developer_emails.split(",")
+      if emails.length > 1
+        emails = emails[0..-2].join(' , ') << " or #{emails[-1]} "
+      end
+      "Please create an account or login with #{emails}"
+    end
+
+  if notice != SiteSetting.global_notice
+    SiteSetting.global_notice = notice
+    SiteSetting.has_login_hint = true
+  end
+
+# we may be booting with no User table eg: first migration, just skip
+end rescue nil

config/site_settings.yml

@@ -479,6 +479,9 @@ uncategorized:
   global_notice:
     default: ""
     client: true
+  has_login_hint:
+    default: false
+    hidden: true
 
   # Category IDs
   lounge_category_id: