feat: move migrations

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/post3-server/tests/common/mod.rs

@@ -44,7 +44,7 @@ impl TestServer {
             .unwrap();
 
         // Run migrations
-        post3::MIGRATOR.run(&pool).await.unwrap();
+        sqlx::migrate!("./migrations").run(&pool).await.unwrap();
 
         // Clean slate
         sqlx::query("DELETE FROM upload_parts").execute(&pool).await.unwrap();