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vault: add arrstack policies (deployer + KV read + creds) (2/3) (#126)
## Why

Grants the Vault access the arrstack engine needs, before any engine resources exist. **PR 2 of 3 (policy)**, stacked on #125 (register). Keeping policy separate from resources honours the never-bundle / sequential-apply rule.

## Change

- Adds `policies/arrstack/admin.yaml`: the terraform-vault deployer (`tf_vault` approle + `woodpecker_terraform_vault` k8s role) may create/read/update/delete `arrstack/config` and manage `arrstack/roles/*`.
- Adds `policies/kv/kubernetes/namespace/arrstack/default/arrproxy-admin-token/read.yaml`: the deployer may read the KV-seeded arrproxy admin token (both `kv/data/...` and `kv/metadata/...`) that the engine config sources. The existing `secret_backends_read` policy does not cover this `kubernetes/namespace` KV path.
- Adds `policies/arrstack/creds/{sonarr,radarr,prowlarr}.yaml`: each `terraform-<app>` run may read its own `arrstack/creds/<app>` to mint a scoped key.
- Policy YAMLs are auto-discovered by `policies/policies.hcl`, so no wiring changes are needed.

## Apply order

Apply **after PR #125 (register)**. Safe to apply before the engine exists — these only grant capabilities on paths.

## Stack

1. register -> #125
2. **policy (this PR)** -> `benvin/arrstack-policy` off `benvin/arrstack-register`
3. resources -> `benvin/arrstack-resources`

Supersedes #124.

Reviewed-on: #126
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>
2026-08-19 22:54:13 +10:00

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YAML

# Allow management of the arrstack secrets engine (config and roles) by the
# terraform-vault deployer.
---
rules:
- path: "arrstack/config"
capabilities:
- create
- update
- read
- delete
- path: "arrstack/roles/*"
capabilities:
- create
- update
- delete
- read
- list
- path: "arrstack/roles"
capabilities:
- read
- list
auth:
approle:
- tf_vault
k8s/au/syd1:
- woodpecker_terraform_vault