fix: silent skip if oriole not in the install

Author: samrose

migrations/db/migrations/20241031003909_create_orioledb.sql

@@ -1,10 +1,11 @@
--- migrate:up
 do $$ 
 begin 
-    if not exists (select 1 from pg_extension where extname = 'orioledb') then
-        create extension if not exists orioledb;
+    if exists (select 1 from pg_available_extensions where name = 'orioledb') then
+        if not exists (select 1 from pg_extension where extname = 'orioledb') then
+            create extension if not exists orioledb;
+        end if;
     end if;
 end $$;
 
 -- migrate:down
-drop extension if exists orioledb;
+drop extension if exists orioledb;