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zegit-forgejo-runner/Dockerfile
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Docker

# Custom toolchain image for the self-hosted Gitea Actions (Forgejo) runner.
#
# The cluster runs act_runner in *host mode* (docker disabled), so workflow steps
# execute INSIDE this image. The stock forgejo/runner image is minimal and lacks
# node (needed by JS actions: actions/checkout, setup-go, ...), git, make, etc.
# The runner pod is non-root with all caps dropped, so it cannot apt/apk-add at
# runtime -- the tools must be baked in here.
#
# PUBLISHING IS AUTOMATED. Run the "build image" workflow on GitHub with a tag
# (e.g. 12.11.1-ci4); it builds both architectures and pushes to
# ghcr.io/zegit-zoo/zegit-forgejo-runner. ./push-image.sh remains for building
# by hand. README.md explains why the registry moved off Gitea (Cloudflare's
# request-body cap returns 413 on a registry layer) and why the build cannot run
# on our own runners (host mode, all capabilities dropped).
#
# Then in flux-config set the image on BOTH deployment-zegit-runner and
# deployment-forgejo-runner, digest-pinned.
#
# The image is NOT public. Pulls need a registry credential in
# forgejo-runner-system -- github-registry-credentials for ghcr.io. An earlier
# version of this comment claimed the package was public and needed no secret;
# that was wrong for the Gitea registry too, which is private.
FROM code.forgejo.org/forgejo/runner:12.11.1
USER root
# nodejs -> JS actions runtime (actions/checkout, actions/setup-go, ...)
# git -> checkout
# git-daemon -> provides git-http-backend, which Alpine splits OUT of the `git`
# package (git alone ships git-remote-http/https but NOT the CGI
# backend). Without it, internal/forgeprobe's smart-HTTP tests died
# with "fork/exec git-http-backend: no such file or directory" and
# reported three FAILURES for a missing tool — which turned Gitea CI
# red on every zegit master commit while GitHub stayed green, for
# hours, unnoticed.
# bash -> `shell: bash` steps and many action entrypoints
# coreutils-> GNU userland (alpine busybox tools trip up some scripts)
# curl,tar -> setup-go / gitleaks download + extract their own arch-specific binaries
# make -> zegit Makefile targets
# ca-certificates -> trusted roots for HTTPS to gitea/github/goproxy
# gcc,musl-dev -> C toolchain for cgo; `go test -race` (the Makefile test
# target) requires cgo, which needs a C compiler + libc headers
# (musl on Alpine)
# python3,py3-yaml -> the repo's own gates are Python: credentials-coverage.sh,
# validate-admission.sh and feature-lint.sh all shell out to
# python3, and credentials-coverage parses manifests with yaml
#
# Go is intentionally NOT baked in: actions/setup-go fetches the pinned version
# per-run (node + tar are present), so the image needs no rebuild on Go bumps.
RUN apk add --no-cache \
nodejs \
git \
git-daemon \
bash \
coreutils \
curl \
tar \
make \
ca-certificates \
gcc \
musl-dev \
python3 \
py3-yaml
# Match the runner pod's runAsUser (1000); keep the image non-root by default.
USER 1000