fix Dockerfile: run pip install as root before switching to user

Dockerfile

@@ -2,22 +2,22 @@ FROM python:3.11-slim
 
 RUN apt-get update -qq && apt-get install -y -qq git && rm -rf /var/lib/apt/lists/*
 
-RUN useradd -m -u 1000 user
-USER user
-ENV PATH="/home/user/.local/bin:$PATH"
-
 WORKDIR /app
 
-# Copy requirements and install dependencies
-COPY --chown=user requirements.txt .
-COPY --chown=user scripts/ scripts/
+# Copy requirements and install dependencies (as root)
+COPY requirements.txt .
+COPY scripts/ scripts/
 RUN pip install --no-cache-dir -r requirements.txt && \
     python -c "import site; import shutil; shutil.copy('scripts/utils_shim.py', f'{site.getsitepackages()[0]}/utils.py')" && \
     rm -rf scripts
 
 # Copy application code
-COPY --chown=user app/ app/
-COPY --chown=user prompts/ prompts/
+COPY app/ app/
+COPY prompts/ prompts/
+
+RUN useradd -m -u 1000 user && chown -R user:user /app
+USER user
+ENV PATH="/home/user/.local/bin:$PATH"
 
 # Expose HF Space port
 EXPOSE 7860