keep already started containers, multi threaded async

src/migrations.rs

@@ -8,10 +8,6 @@ pub const MIGRATIONS: EmbeddedMigrations = embed_migrations!("./migrations");
 
 pub fn run_migrations(pool: &DbPool) -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
 
-    // This will run the necessary migrations.
-    //
-    // See the documentation for `MigrationHarness` for
-    // all available methods.
     let connection = &mut pool.get().unwrap();
     connection.run_pending_migrations(MIGRATIONS)?;