feat(backend) scheduler rewrite (deadlock for now)

backend/server/src/scheduler/tasks/basic.rs

@@ -1,5 +1,4 @@
-use std::error::Error;
-use std::str::FromStr;
+use std::{error::Error, pin::Pin, str::FromStr};
 
 use crate::scheduler::{task_func::TaskFunc, tasks::CronTask};
 
@@ -32,7 +31,7 @@ impl CronTask for BasicTask {
         self.schedule.upcoming(Utc).next()
     }
 
-    fn call(&self) {
-        (self.func)()
+    fn call(&self) -> Pin<Box<dyn Future<Output = ()> + Send + '_>> {
+        Box::pin(async { (self.func)() })
     }
 }