FROM ubuntu:latest ARG TAILSCALE_VERSION RUN apt-get update \ && apt-get install -y gnupg curl \ && curl -fsSL https://pkgs.tailscale.com/stable/ubuntu/focal.gpg | apt-key add - \ && curl -fsSL https://pkgs.tailscale.com/stable/ubuntu/focal.list | tee /etc/apt/sources.list.d/tailscale.list \ && apt-get update \ && apt-get install -y tailscale=${TAILSCALE_VERSION} dnsutils \ && rm -rf /var/lib/apt/lists/*