feat(docker): set up Python virtual environment and update dependencies in Dockerfile and CI workflow

Dockerfile

@@ -6,14 +6,22 @@ WORKDIR /app
 
 # Install system dependencies
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends gcc && \
+    apt-get install -y --no-install-recommends gcc python3-venv && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
+# Create and activate virtual environment
+ENV VIRTUAL_ENV=/opt/venv
+RUN python -m venv $VIRTUAL_ENV
+ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+
+# Upgrade pip and essential tools
+RUN pip install --no-cache-dir --upgrade pip setuptools wheel
+
 # Copy requirements first for better caching
 COPY requirements.txt .
 
-# Install Python dependencies
+# Install Python dependencies in venv
 RUN pip install --no-cache-dir -r requirements.txt
 
 # Copy the source code