feat: psql changes on master only

- add fact to detect if a psql host is a slave
- only import users/db/grants on master

modules/libs/lib/facter/psql_is_slave.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+Facter.add(:psql_is_slave) do
+  setcode do
+    # Command to check if PostgreSQL is in recovery mode
+    command = 'sudo -iu postgres psql -tAc "select pg_is_in_recovery()"'
+
+    # Execute the command and map the output to a boolean value
+    { 't' => true, 'f' => false }[Facter::Core::Execution.execute(command, on_fail: nil)]
+  end
+end