Fix PyTorch verification command in Dockerfile using heredoc for robust multi-line Python

Dockerfile

@@ -19,7 +19,7 @@ WORKDIR /app
 RUN apt-get update && apt-get install -y --no-install-recommends \
     wget \
     git \
-    build-essential \
+    build-essential \ 
     libgl1-mesa-glx \
     # Clean up apt cache to reduce image size
     && rm -rf /var/lib/apt/lists/*