feat: add identity secrets

- add kubernetes auth role for identity namespace
- add policy to access openldap bootstrap credentials

config/auth_kubernetes_role/k8s/au/syd1/identity.yaml

@@ -0,0 +1,6 @@
+bound_service_account_names:
+  - default
+bound_service_account_namespaces:
+  - identity
+token_ttl: 60
+audience: vault

policies/kv/service/openldap/ldap_admin_password/read.yaml

@@ -0,0 +1,10 @@
+# Allow reading Radarr configuration
+---
+rules:
+  - path: "kv/data/service/openldap/ldap_admin_password"
+    capabilities:
+      - read
+
+auth:
+  k8s/au/syd1:
+    - identity