# Job-container image for the LAN Forgejo Actions runner's `docker`-labeled
# jobs (see ../register-lan-runner.sh) — used by every backend/frontend
# build-push, deploy, and validation workflow that needs `docker build`.
#
# Replaces the stock node:20-bookworm image. That base is pure leftover from
# when the frontend was a Python/Jinja app the old GitHub runner also built
# JS assets for; the frontend is Go now (no npm/node anywhere in
# .forgejo/workflows/) so carrying a full Node runtime here just adds weight.
# Every workflow using the `docker` label also currently re-provisions the
# Docker CLI itself on each run via `apt-get install docker.io` — that step
# costs ~15-20s per job and, more importantly, installs the CLASSIC Docker
# builder rather than BuildKit, which mishandles `COPY --chown=<name>` group
# resolution on images without a matching system group (a real bug hit during
# the frontend Go rewrite). Installing docker-buildx-plugin here makes
# BuildKit the default, closing that bug class, on a much smaller base.
#
# Build/push (manual — see ../README.md for when to rebuild):
#   docker build -t git.thermograph.org/emi/thermograph/ci-runner:vN \
#     infra/deploy/forgejo/ci-runner
#   docker push git.thermograph.org/emi/thermograph/ci-runner:vN
#
# Cutting over the live runner to a new tag means editing the `labels` array
# in ~/forgejo-runner/.runner on the runner host directly (same runner
# id/token, no re-registration needed) and updating register-lan-runner.sh's
# LABELS default so future re-provisioning picks it up too.
FROM debian:bookworm-slim

RUN apt-get update -qq \
    && apt-get install -y -qq --no-install-recommends \
        ca-certificates curl gnupg git python3 python3-yaml \
    && install -m 0755 -d /etc/apt/keyrings \
    && curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc \
    && chmod a+r /etc/apt/keyrings/docker.asc \
    && echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian bookworm stable" \
        > /etc/apt/sources.list.d/docker.list \
    && apt-get update -qq \
    && apt-get install -y -qq --no-install-recommends docker-ce-cli docker-buildx-plugin \
    && rm -rf /var/lib/apt/lists/* /etc/apt/sources.list.d/docker.list

RUN docker --version && docker buildx version && git --version \
    && python3 -c "import yaml; print('PyYAML', yaml.__version__)"