Copy scripts/ directory into Docker container

The Dockerfile was missing COPY scripts/ which caused voices-xtts
to fail when trying to run download_samples.sh

🦝 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Dockerfile

@@ -34,6 +34,7 @@ RUN if [ "${USE_ROCM}" = "1" ]; then mv /app/requirements-rocm.txt /app/requirem
 RUN --mount=type=cache,target=/root/.cache/pip pip install -r requirements.txt
 
 COPY *.py *.sh *.default.yaml README.md LICENSE /app/
+COPY scripts/ /app/scripts/
 
 ARG PRELOAD_MODEL
 ENV PRELOAD_MODEL=${PRELOAD_MODEL}