proxy: scheduler: only do a single round of time alignment and drop counter

not much value in waiting an extra minute, that doesn't really
guarantees better scheduling (as in, less impact on startup).

Dropping that also allows easily to drop the counter by just moving
the sleep to the beginning of the loop.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/bin/proxmox-backup-proxy.rs

@@ -527,26 +527,19 @@ fn next_minute() -> Instant {
 }
 
 async fn run_task_scheduler() {
-    let mut count: usize = 0;
-
     loop {
-        count += 1;
-
+        // sleep first to align to next minute boundary for first round
         let delay_target = next_minute();
-
-        if count > 2 {
-            // wait 1..2 minutes before starting
-            match schedule_tasks().catch_unwind().await {
-                Err(panic) => match panic.downcast::<&str>() {
-                    Ok(msg) => eprintln!("task scheduler panic: {msg}"),
-                    Err(_) => eprintln!("task scheduler panic - unknown type"),
-                },
-                Ok(Err(err)) => eprintln!("task scheduler failed - {err:?}"),
-                Ok(Ok(_)) => {}
-            }
-        }
-
         tokio::time::sleep_until(tokio::time::Instant::from_std(delay_target)).await;
+
+        match schedule_tasks().catch_unwind().await {
+            Err(panic) => match panic.downcast::<&str>() {
+                Ok(msg) => eprintln!("task scheduler panic: {msg}"),
+                Err(_) => eprintln!("task scheduler panic - unknown type"),
+            },
+            Ok(Err(err)) => eprintln!("task scheduler failed - {err:?}"),
+            Ok(Ok(_)) => {}
+        }
     }
 }