Add build version label to Dockerfile to enforce rebuilds when necessary

Dockerfile

@@ -8,6 +8,9 @@ ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
     PORT=7860
 
+# Add build version to force rebuild when needed
+LABEL build_version="1.0.1"
+
 # Install only the required system dependencies
 RUN apt-get update && apt-get install -y --no-install-recommends \
     gcc \