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/*