Dockerfile

FROM ubuntu:latest

WORKDIR app

COPY app ./app

RUN chmod +x /app/app && apt-get update && apt-get install -y curl ca-certificates

COPY <<-"EOF" /app/resolv.conf
nameserver 1.1.1.1
nameserver 1.0.0.1
nameserver 2606:4700:4700::1111
nameserver 2606:4700:4700::1002
EOF

COPY --chmod=755 <<-"EOF" /entrypoint.sh
#!/bin/bash
cat /app/resolv.conf > /etc/resolv.conf
sleep 3
exec "$@"
EOF

ENTRYPOINT ["/entrypoint.sh"]

CMD ["/app/app", "-output", "/app/results.json", "-timeout", "1s", "-workers", "100"]