fix: race on cluster init by waiting for corrosion service to become ready with schema applied

internal/machine/corroservice/systemd.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"log/slog"
 	"os/exec"
-	"time"
 )
 
 const DefaultSystemdUnit = "uncloud-corrosion.service"
@@ -44,20 +43,15 @@ func (s *SystemdService) startOrRestart(ctx context.Context, cmd string) error {
 	if _, err := exec.Command("systemctl", cmd, s.Unit).Output(); err != nil {
 		return fmt.Errorf("systemctl %s %s: %w", cmd, s.Unit, err)
 	}
-	slog.Info(fmt.Sprintf("Corrosion systemd service %sed.", cmd), "unit", s.Unit)
+	slog.Debug(fmt.Sprintf("Corrosion systemd service %sed.", cmd), "unit", s.Unit)
 
-	// Optimistically wait for the corrosion service to start and initialise the database schema before proceeding.
-	timer := time.NewTimer(2 * time.Second)
-	defer timer.Stop()
-
-	select {
-	case <-timer.C:
-	case <-ctx.Done():
-		return nil
+	slog.Debug("Waiting for corrosion service to be ready.")
+	if err := WaitReady(ctx, s.DataDir); err != nil {
+		return err
 	}
-
-	// TODO: run a goroutine to check the status of the service and log any errors in the uncloud log.
+	slog.Debug("Corrosion service is ready.")
 	s.running = true
+
 	return nil
 }