Add installation of system dependencies in Dockerfile

Dockerfile

@@ -1,6 +1,13 @@
 # Use official Python image
 FROM python:3.11-slim
 
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    default-libmysqlclient-dev \
+    build-essential \
+    pkg-config \
+    && rm -rf /var/lib/apt/lists/*
+
 # Set environment vars
 ENV PYTHONDONTWRITEBYTECODE 1
 ENV PYTHONUNBUFFERED 1