Add MariaDB HTTP readiness service

Dockerfile

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+FROM python:3.12-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PORT=8080
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt \
+    && useradd --system --uid 10001 --create-home app
+
+COPY --chown=10001:10001 server.py .
+
+USER 10001:10001
+EXPOSE 8080
+
+CMD ["python", "server.py"]