Upgrade forgejo-runner 12.7.0 → 12.7.3, add service card

Patch upgrade picks up idempotent FetchTask API, offline registration
fix, cloudflare/circl security dep update, and custom gRPC user-agent.
No config defaults changed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/reference/services/forgejo-runner.md

@@ -0,0 +1,56 @@
+---
+title: Forgejo Runner
+modified: 2026-03-30
+last-reviewed: 2026-03-30
+tags:
+  - service
+  - ci-cd
+---
+
+# Forgejo Runner
+
+Forgejo Actions runner daemon for CI/CD job execution. Runs as a Kubernetes pod on [[indri]] (minikube) with a Docker-in-Docker sidecar.
+
+## Quick Reference
+
+| Property | Value |
+|----------|-------|
+| **Namespace** | `forgejo-runner` |
+| **ArgoCD App** | `forgejo-runner` |
+| **Runner Name** | `k8s-runner` |
+| **Labels** | `k8s` |
+| **Capacity** | 2 concurrent jobs |
+| **Timeout** | 3h |
+| **Forgejo Instance** | https://forge.ops.eblu.me |
+| **Image** | `code.forgejo.org/forgejo/runner` (see `argocd/manifests/forgejo-runner/kustomization.yaml` for current tag) |
+| **DinD Sidecar** | `docker:27-dind` |
+
+## Architecture
+
+The pod runs two containers:
+
+1. **runner** - The Forgejo runner daemon. Registers with the forge on first start, then polls for jobs. Talks to DinD via `tcp://localhost:2375`.
+2. **dind** - Docker-in-Docker sidecar (privileged). Provides the Docker daemon for job container execution. Uses a registry mirror at `host.minikube.internal:5050` ([[zot]]).
+
+Runner state (`/data/.runner`) is stored in an `emptyDir` volume, so re-registration happens on pod restart. The registration token comes from 1Password via [[external-secrets]].
+
+## Job Execution Image
+
+The actual container image used to run workflow steps is set via `RUNNER_LABELS` in the deployment, not in the runner config. This image is tracked separately as `runner-job-image` in `service-versions.yaml`. See [[build-container-image]] for how it's built.
+
+## Network
+
+Jobs run with `network: "host"` to share the DinD network namespace. This gives job containers access to the same DNS and network as the pod, including cluster-internal services.
+
+## Credentials
+
+| Secret | Source | Purpose |
+|--------|--------|---------|
+| `RUNNER_TOKEN` | 1Password ("Forgejo Secrets" → `runner_reg`) | Runner registration with forge |
+
+## Related
+
+- [[forgejo]] - The forge this runner connects to
+- [[argocd]] - Deployment mechanism
+- [[zot]] - Registry mirror for job image pulls
+- [[build-container-image]] - How container images are built via this runner