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Add arrstack creds role and k8s auth for mediamark (#141)
## Why

mediamark (kids-content marking UI, namespace `mediamark`) needs Sonarr/Radarr access to list series/movies and read metadata + artwork. It should get ephemeral virtual arrproxy keys from the arrstack secrets engine via arrproxy, not a copy of the static app API keys.

## How

- `config/arrstack_secret_backend_role/arrstack/mediamark.yaml` — role minting keys scoped to `sonarr` + `radarr` (no prowlarr), `ttl: 60` / `max_ttl: 86400`, mirroring the existing per-app roles.
- `config/auth_kubernetes_role/k8s/au/syd1/mediamark.yaml` — k8s auth role `mediamark`, bound to serviceaccount `default` in namespace `mediamark`, `token_ttl`/`token_max_ttl` 600, audience `vault`.
- `policies/arrstack/creds/mediamark.yaml` — `read` on `arrstack/creds/mediamark`, granted to `k8s/au/syd1: [mediamark]` only (deliberately not the shared `default` k8s role, which would expose the creds to every namespace).

Engine mount/config and the existing roles are untouched.

## Note

The companion argocd-apps change consumes `arrstack/creds/mediamark` via a `VaultDynamicSecret` (response fields: `token`, `id`, `apps`, `subject`, `expires_at`).

**GET/HEAD-only is not expressible today.** `arrstack_secret_backend_role` carries `apps`/`ttl`/`max_ttl` only, and arrproxy scopes machine tokens by app — the GET/HEAD restriction on the cheeztv/kids tier is a grant on an OIDC *group*, not on a minted token. The role is scoped as tightly as the engine allows and the limitation is documented in the yaml; per-token method scoping needs a plugin + arrproxy feature.

Reviewed-on: #141
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>
2026-08-30 09:40:26 +10:00

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YAML

---
# Kubernetes auth role for the mediamark app: the default service account in the
# mediamark namespace, used by VaultDynamicSecret to read arrstack/creds/mediamark.
bound_service_account_names:
- default
bound_service_account_namespaces:
- mediamark
token_ttl: 600
token_max_ttl: 600
audience: vault