Build Flask WAF log converter app

Dockerfile

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+FROM python:3.12-slim AS base
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1
+
+WORKDIR /app
+
+COPY pyproject.toml README.md ./
+COPY app ./app
+COPY tests ./tests
+COPY wsgi.py ./
+
+RUN useradd --create-home appuser && \
+    mkdir -p /app/instance/outputs && \
+    chown -R appuser:appuser /app
+
+FROM base AS production
+
+ENV OUTPUT_DIRECTORY=/app/instance/outputs
+
+RUN pip install --no-cache-dir .
+
+USER appuser
+
+EXPOSE 8000
+
+CMD ["gunicorn", "--bind", "0.0.0.0:8000", "--workers", "2", "--threads", "4", "wsgi:app"]
+
+FROM base AS test
+
+ENV OUTPUT_DIRECTORY=/app/instance/outputs
+
+RUN pip install --no-cache-dir ".[dev]"
+
+USER appuser
+
+CMD ["python", "-m", "pytest"]