feat: enable plugins for vault/openbao (#447)

- install openbao-plugins
- add plugin_directory

Reviewed-on: #447

hieradata/roles/infra/storage/vault.yaml

@@ -2,6 +2,7 @@
 profiles::vault::server::members_role: roles::infra::storage::vault
 profiles::vault::server::members_lookup: true
 profiles::vault::server::data_dir: /data/vault
+profiles::vault::server::plugin_dir: /opt/openbao-plugins
 profiles::vault::server::manage_storage_dir: true
 profiles::vault::server::tls_disable: false
 vault::package_name: openbao
@@ -23,3 +24,6 @@ profiles::nginx::simpleproxy::proxy_scheme: 'http'
 profiles::nginx::simpleproxy::proxy_host: '127.0.0.1'
 profiles::nginx::simpleproxy::proxy_port: 8200
 profiles::nginx::simpleproxy::proxy_path: '/'
+
+profiles::packages::include:
+  openbao-plugins: {}