FROM ubuntu:18.04

ARG RUNNER_VERSION
ARG DOCKER_VERSION

RUN apt update \
  && apt install curl ca-certificates -y --no-install-recommends \
  && curl -L -o docker.tgz https://download.docker.com/linux/static/stable/x86_64/docker-${DOCKER_VERSION}.tgz \
  && tar zxvf docker.tgz \
  && install -o root -g root -m 755 docker/docker /usr/local/bin/docker \
  && rm -rf docker docker.tgz \
  && curl -L -o /usr/local/bin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v1.2.2/dumb-init_1.2.2_amd64 \
  && chmod +x /usr/local/bin/dumb-init \
  && adduser --disabled-password --gecos "" --uid 1000 runner

RUN mkdir -p /runner \
  && cd /runner \
  && curl -L -o runner.tar.gz https://github.com/actions/runner/releases/download/v${RUNNER_VERSION}/actions-runner-linux-x64-${RUNNER_VERSION}.tar.gz \
  && tar xzf ./runner.tar.gz \
  && rm runner.tar.gz \
  && ./bin/installdependencies.sh

COPY entrypoint.sh /runner

USER runner:runner
ENTRYPOINT ["/usr/local/bin/dumb-init", "--"]
CMD ["/runner/entrypoint.sh"]