Update Dockerfile

Dockerfile

@@ -1,8 +1,4 @@
 # ── Base image ────────────────────────────────────────────────────────────────
-# Use python:3.11-slim for CPU Spaces (free tier).
-# For GPU Spaces swap to:
-#   FROM nvidia/cuda:12.1.0-cudnn8-runtime-ubuntu22.04
-# and add Python install steps below.
 FROM python:3.11-slim
 
 # ── Environment ───────────────────────────────────────────────────────────────
@@ -14,8 +10,6 @@ ENV PYTHONUNBUFFERED=1 \
     PIP_DISABLE_PIP_VERSION_CHECK=1
 
 # ── System deps ───────────────────────────────────────────────────────────────
-# espeak-ng  → required by piper-phonemize (used inside piper-tts)
-# libsndfile1 → audio I/O
 RUN apt-get update && apt-get install -y --no-install-recommends \
         gcc g++ git wget curl \
         espeak-ng espeak-ng-data \
@@ -28,26 +22,16 @@ RUN useradd -m -u 1000 appuser
 
 # ── Python dependencies ───────────────────────────────────────────────────────
 COPY requirements.txt .
-# Install CPU-only torch first to keep image size reasonable
 RUN pip install torch==2.5.1 --index-url https://download.pytorch.org/whl/cpu \
     && pip install -r requirements.txt
 
-# ── Pre-build optimum-quanto C++ extension (must run as root) ────────────────
-# quanto lazily compiles a C++ kernel on first use and writes into the package
-# directory. Pre-building here (as root) avoids a PermissionError when the
-# container later runs as the unprivileged appuser.
-# freeze() is required after quantize() — without it, weights are NoneType
-# and the forward pass crashes with a TypeError.
-RUN python -c "\
-import torch; \
-import torch.nn as nn; \
-from optimum.quanto import quantize, freeze, qint4; \
-m = nn.Linear(8, 8); \
-quantize(m, weights=qint4); \
-freeze(m); \
-_ = m(torch.randn(1, 8)); \
-print('optimum-quanto C++ extension built successfully') \
-"
+# ── Fix optimum-quanto C++ extension permissions ──────────────────────────────
+# quanto JIT-compiles a C++ kernel on first use and writes to a `build/`
+# directory inside the package. Since the container runs as non-root appuser,
+# we pre-create that directory as root and make it world-writable so the
+# runtime compilation succeeds without a PermissionError.
+RUN mkdir -p /usr/local/lib/python3.11/site-packages/optimum/quanto/library/extensions/cpp/build \
+    && chmod 777 /usr/local/lib/python3.11/site-packages/optimum/quanto/library/extensions/cpp/build
 
 # ── Piper TTS voice model ─────────────────────────────────────────────────────
 RUN mkdir -p /app/models \