this will left production in ruins

services/checker/Dockerfile.checker

@@ -0,0 +1,19 @@
+FROM docker.io/python:3.11-slim
+
+ENV PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY checker_requirements.txt .
+
+RUN pip install --no-cache-dir -r checker_requirements.txt
+
+RUN useradd -m appuser && chown -R appuser /app
+USER appuser
+
+WORKDIR /app
+
+CMD ["python"]