Fix: Docker container fails

The YOLO ML backend Docker container was failing to start with the error:
exec /app/start.sh: no such file or directory
yolo exited with code 255

Author: rockyxwall

label_studio_ml/examples/yolo/Dockerfile

@@ -59,4 +59,6 @@ RUN /bin/sh -c 'if [ ! -f /app/models/yolov8m.pt ]; then \
 
 ENV PYTHONPATH=/app
 
-CMD ["/app/start.sh"]
+RUN sed -i 's/\r$//' /app/start.sh && chmod +x /app/start.sh
+
+CMD ["/app/start.sh"]