Add week 7 materials

materials/07-naming-lookup/seminar/Dockerfile

@@ -0,0 +1,7 @@
+FROM debian:bookworm-slim
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    python3 python3-libtorrent bind9 bind9-utils dnsutils curl ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+ENV PYTHONUNBUFFERED=1 PYTHONDONTWRITEBYTECODE=1
+WORKDIR /lab
+CMD ["sleep", "infinity"]