<!--
SPDX-FileCopyrightText: 2026 Stan Grams <sjg@haxx.space>
SPDX-License-Identifier: GPL-2.0-or-later
-->

# Podman-based Gitea Actions runners

Run two independent Gitea Actions runners on one host as rootless Podman
containers managed by systemd (Quadlet) — one per project — instead of two
VMs. Uses the **host executor**: workflow steps run directly inside a
purpose-built runner image that already has the Rust toolchain and all build
dependencies baked in, so CI runs skip the per-run install cost and no
Docker/Podman socket is needed.

## Files

| File | Purpose |
|------|---------|
| `Containerfile` | Runner image: Debian + build deps + clang + Rust + Node + `reuse` + `act_runner`. |
| `entrypoint.sh` | Registers on first boot (if needed), then runs the daemon. |
| `config.yaml` | act_runner config template (seeded into each runner's volume). |
| `trx-rs-runner.container` | Quadlet unit for the trx-rs runner. |
| `project2-runner.container` | Quadlet unit for the second project's runner. |

## Prerequisites (once per host)

Rootless Podman with cgroups v2 (default on modern distros). As the unprivileged
user that will own the runners:

```bash
# Survive logout / start on boot without an interactive session.
loginctl enable-linger "$USER"
```

No `podman.socket` is required for the host executor.

## 1. Build the image

```bash
cd container
podman build -t trx-rs-ci:latest .
```

## 2. Get a registration token

For **each** repo: *Settings → Actions → Runners → Create new Runner* and copy
the token. (Org- or instance-level tokens work too if you prefer wider scope.)

## 3. Install and start the runners

```bash
mkdir -p ~/.config/containers/systemd
cp trx-rs-runner.container project2-runner.container ~/.config/containers/systemd/

# Paste each repo's token for the FIRST boot only:
#   Environment=GITEA_RUNNER_REGISTRATION_TOKEN=xxxx…
$EDITOR ~/.config/containers/systemd/trx-rs-runner.container
$EDITOR ~/.config/containers/systemd/project2-runner.container

systemctl --user daemon-reload
systemctl --user start trx-rs-runner
systemctl --user start project2-runner

systemctl --user status trx-rs-runner
podman logs -f gitea-runner-trx-rs
```

Once each runner shows **online** in the repo's runner list, blank out the
`GITEA_RUNNER_REGISTRATION_TOKEN` line again (the registration is persisted in
the `…-data` volume) and `systemctl --user daemon-reload`.

## Required workflow change: the `reuse` job

The host executor runs steps directly in the container and therefore **cannot
run Docker-based actions**. The current `reuse` job uses `fsfe/reuse-action@v5`,
which is a Docker action. `reuse` is baked into the image, so replace that job
with a plain command:

```yaml
  reuse:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: REUSE compliance
        run: reuse lint
```

The `lint` and `test` jobs need no changes: their `sudo apt-get …` and rustup
steps still run, but become fast no-ops because the image already has those
packages and the toolchain. (`sudo` is included in the image for exactly this
reason.)

> If you would rather keep Docker-based actions and per-run images, use the
> **Docker executor** instead: drop the `:host` suffix from the label in
> `config.yaml`, enable `systemctl --user --now enable podman.socket`, mount it
> into the container, and set `container.docker_host` to the socket path. That
> trades the baked-in speed for stronger per-job isolation.

## Tuning

- **`capacity`** (in `config.yaml`) — concurrent jobs per runner. Rust builds
  are heavy; 1–2 is sensible when two runners share a host.
- **`PodmanArgs=--cpus/--memory`** (in each `.container`) — hard resource caps
  so one project cannot starve the other.
- **SELinux** — the `:Z` volume flag is already set; keep it if SELinux is
  enforcing.

## Committing these files

If you add this directory to a REUSE-checked repo, register the markdown in
`REUSE.toml` (the other files carry inline SPDX headers):

```toml
[[annotations]]
path = ["container/**"]
SPDX-FileCopyrightText = "2026 Stan Grams <sjg@haxx.space>"
SPDX-License-Identifier = "GPL-2.0-or-later"
```