conditional postgresql version based on platform

modules/timescaledb/manifests/init.pp

@@ -24,11 +24,14 @@ class timescaledb {
       ensure => 'present',
       require => [Apt::Source['postgresql'], Apt::Ppa['ppa:timescale/timescaledb-ppa']]
     }
+    class{ 'postgresql::globals':
+      version => '12',
+    }  
+  } else { # on the pi use version 11
+    class{ 'postgresql::globals':
+      version => '11',
+    }  
   }
-  # timescaledb is compiled manually on the pi
-  class{ 'postgresql::globals':
-    version => '12',
-  }  
   class{ 'postgresql::server':
   }
   postgresql::server::config_entry { 'shared_preload_libraries':