overthinkos/githubrunner
distros/skills/githubrunner/SKILL.md
Self-hosted GitHub Actions runner on CachyOS, fully rootless — runs as uid=1000 with zero added capabilities (no root, no privileged) via container-nesting, with rootless nested podman/buildah/skopeo for CI. Host networking retained for reachability. MUST be invoked before building, deploying, configuring, or troubleshooting the githubrunner box.
development
Updated Jun 22, 2026
$ install --global
skillsauthnpx skillsauth add overthinkos/overthink-plugins githubrunnerInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Jun 22, 2026, 7:03 AM52.2s1 file scanned
SKILL.md
- name:
- githubrunner
- description:
- |
githubrunner
Self-hosted GitHub Actions runner on CachyOS, fully rootless. Shares the
rootless nested-container posture with /charly-openclaw:openclaw-desktop (uid=1000,
no caps, unmask=/proc/* via /charly-distros:container-nesting).
Box Properties
| Property | Value |
|----------|-------|
| Base | cachyos (cachyos.cachyos) |
| Layers | agent-forwarding, github-runner, charly, dbus, container-nesting |
| Build | pac |
| Platforms | linux/amd64 |
| UID / user | 1000 / user (rootless — NO uid/privileged override) |
| Network | host (reach the host-side ghcr pull-through mirror) |
| Security | container-nesting's posture: cap_add:[], security_opt:[unmask=/proc/*], devices /dev/fuse + /dev/net/tun |
| Registry | ghcr.io/overthinkos |
Full Candy Stack
cachyos(docker.io/cachyos/cachyos-v3, via thecachyosimport namespace)agent-forwarding— GPG/SSH/direnv (composes gnupg + direnv + ssh-client)github-runner— the Actions runner agent (under${HOME}/actions-runner), cosign, go/git/jq, qemu-user-static (aarch64 cross-arch CI), the .NET runtime deps, the credential-backed registration, the ghcr mirror configcharly— the charly binary +virtualization+gocryptfs+socatdbus— session bus (for runner hooks)container-nesting— rootless nested podman/buildah/skopeo + the subuid/subgid layout + newuidmap/newgidmap file-caps + containers/storage/policy configs
Rootless posture (genuinely uid 1000, no caps)
The box carries no uid/user/privileged override, so it resolves to
container-nesting's posture: uid=1000, cap_add:[], security_opt:[unmask=/proc/*],
devices /dev/fuse + /dev/net/tun. The runner process (run.sh), all CI jobs,
and rootless nested podman all run as user (uid 1000). See
/charly-distros:container-nesting for the mount_too_revealing() kernel RCA that
makes nested podman work without caps or --privileged.
/charly-coder:sshd (passwordless /etc/sudoers.d/charly-user) is composable if a
workflow genuinely needs sudo; it is not composed by default.
Nested container support
githubrunner composes /charly-distros:container-nesting directly, so CI jobs get
first-class rootless nested podman/buildah/skopeo (uid 1000, /dev/fuse +
unmask=/proc/*, crun + fuse-overlayfs, BUILDAH_ISOLATION=chroot). The
rootless image cache lives under ${HOME}/.local/share/containers. Cross-arch
container builds (aarch64) work via the repo qemu-user-static +
qemu-user-static-binfmt packages.
CI: builds the org's release packages on itself
The repo's release-packages workflow (.github/workflows/release-packages.yml)
runs on this runner via runs-on: [self-hosted, opencharly] — no GitHub-hosted
runner. Because the runner is an Arch (CachyOS) host carrying the FULL charly
PKGBUILD depends= set, all three package formats build here:
- pac builds NATIVELY —
charly box pkg pac→makepkg -sfas uid 1000 (makepkg refuses root; the rootless runner's non-root uid is exactly right). Everydepends=is pre-installed, so makepkg resolves them withoutsudo pacman(the runner has no passwordless sudo). Noarchlinux:latestcontainer. - rpm + deb build distro-natively in the runner's rootless nested podman
(
charly box pkg rpm deb).
workflow_dispatch runs the build jobs from a branch (the release-upload step is
tag-guarded), so the build is exercisable without minting a tag. The github-runner
candy completes the charly runtime on the runner — beyond the .NET/runner deps it adds
the depends= packages the charly/virtualization candies don't already provide
(slirp4netns, libisoburn, cdrtools, swtpm).
Token mechanism (credential-backed; obtained via gh)
RUNNER_TOKEN is a secret_accept (credential-store-backed — never written to
charly.yml or the quadlet); RUNNER_ORG is an env_accept. The registration
token is short-lived and only consumed once at charly config time (the registered
runner persists its own .credentials on the state volume), so it is obtained
fresh from gh. The post_enable/pre_remove hooks are guarded — they skip
when RUNNER_TOKEN is empty, so a token-less deploy (e.g. an check bed) brings the
image up without registering, and a stale token never errors a teardown.
# Obtain a fresh org registration token and register:
TOKEN=$(gh api -X POST /orgs/<org>/actions/runners/registration-token --jq .token)
charly config githubrunner -e RUNNER_ORG=<org> -e RUNNER_TOKEN="$TOKEN" # token scrubbed → credential store
charly start githubrunner
Removal deregisters via the pre_remove hook, which needs a remove-token
(distinct from the registration token):
charly remove githubrunner -e RUNNER_TOKEN=$(gh api -X POST /orgs/<org>/actions/runners/remove-token --jq .token)
Lifecycle
charly box build githubrunner
charly config githubrunner -e RUNNER_ORG=<org> -e RUNNER_TOKEN="$TOKEN"
charly start githubrunner
charly stop githubrunner
charly remove githubrunner -e RUNNER_TOKEN=<remove-token>
Key Candies
/charly-distros:github-runner— runner agent, hooks, registration, ghcr mirror, .NET deps + the charly-hostdepends=completion (native pac builds in CI)/charly-distros:container-nesting— rootless nested podman/buildah/skopeo, subuid layout, caps/charly-tools:charly— the charly binary + virtualization + gocryptfs + socat/charly-distros:agent-forwarding— GPG/SSH/direnv for the.secretsworkflow
Related Boxes
/charly-distros:cachyos— the CachyOS base (parent, via thecachyosnamespace)/charly-openclaw:openclaw-desktop— same rootless container-nesting posture (uid 1000, no caps)/charly-distros:charly-fedora,/charly-coder:charly-arch— the charly-toolchain siblings (root path, box-level full-hammer security)
Related Commands
/charly-core:charly-config— deploy setup with RUNNER_ORG (env) / RUNNER_TOKEN (secret)/charly-core:start,/charly-core:stop,/charly-core:remove— lifecycle + pre-remove deregistration/charly-core:charly-status,/charly-core:logs— verify runner is idle + troubleshoot/charly-build:secrets— the credential store backingRUNNER_TOKEN
Verification
Build-scope (charly check box githubrunner) + deploy-scope (charly check live) checks
ship on the github-runner candy (functional: config.sh --version proves the
.NET deps resolved; rootless nested podman run proves the posture). The
disposable R10 bed is check-githubrunner-pod (charly check run check-githubrunner-pod)
— it proves the rootless composition WITHOUT GitHub registration (no token →
guarded hooks no-op).
After charly start against a registered deploy:
charly status githubrunner— container runningcharly shell githubrunner -c "id"— uid=1000(user) (rootless)charly shell githubrunner -c "podman run --rm quay.io/libpod/alpine:latest true"— rootless nested podman works- Runner appears as "Idle" in the org's Settings > Actions > Runners
When to Use This Skill
MUST be invoked when the task involves the githubrunner box, self-hosted runners, or GitHub Actions CI/CD. Invoke this skill BEFORE reading source code or launching Explore agents.
Related
/charly-image:image— image family umbrella (candy:image entries — those carryingbase:/from:— incharly.yml, build/validate/inspect/list)/charly-build:build— the embedded build vocabulary (distros, builders, init-systems)/charly-check:check— thecheck:checks + thecheck-githubrunner-podR10 bed
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