Update Dockerfile

Author: do6pbln9l

Dockerfile

@@ -5,4 +5,7 @@ COPY scripts/test-8000.py /app/test-8000.py
 RUN useradd -m appuser
 USER appuser
 EXPOSE 8000
+LABEL org.opencontainers.image.source="https://github.com/do6pbln9l/hh-oauth2-keendns-nginx-systemd"
+LABEL org.opencontainers.image.title="HeadHunter OAuth2 Infrastructure — Test Server"
+LABEL org.opencontainers.image.description="Minimal HTTP test server for validating nginx/KeenDNS reverse-proxy and OAuth callback path."
 CMD ["python", "/app/test-8000.py"]