Update Dockerfile to specify Python 3.12 base image and enhance virtual environment setup

Dockerfile

@@ -1,5 +1,5 @@
-# FROM python:3.13-slim
-FROM ghcr.io/astral-sh/uv:bookworm-slim
+FROM ghcr.io/astral-sh/uv:python3.12-bookworm-slim
+
 # Set proper terminal environment for Textual
 ENV TERM=xterm-256color
 ENV COLORTERM=truecolor
@@ -8,24 +8,29 @@ ENV PYTHONUNBUFFERED=1
 # HF Spaces will set SPACE_HOST automatically, but we can provide a fallback
 ENV SPACE_HOST=${SPACE_HOST:-http://localhost:7860}
 
-# Install system dependencies
+# Install system dependencies (git needed for GitHub installs)
 RUN apt-get update && apt-get install -y \
-    gcc \
     git \
     && rm -rf /var/lib/apt/lists/*
 
 # Create app directory
 WORKDIR /app
 
-# Copy requirements and install Python dependencies
+# Create a virtual environment using uv
+RUN uv venv .venv
+
+# Copy requirements and install Python dependencies into the venv
 COPY requirements.txt .
 RUN uv pip install -r requirements.txt
 
 # Copy application files
 COPY serve.py .
 
+# Activate the virtual environment by putting it in PATH
+ENV PATH="/app/.venv/bin:$PATH"
+
 # Expose the port that HF Spaces expects
 EXPOSE 7860
 
-# Run the server
+# Run the server with the venv's Python
 CMD ["python", "serve.py"]