Deploy the GPG/OpenPGP secrets engine to the OpenBao (vault-role) cluster by installing its plugin RPM into `/opt/openbao-plugins`, mirroring the existing `openbao-plugin-secrets-litellm` deployment (#479).
- Add `openbao-plugin-secrets-gpg` to `profiles::packages::include` in the vault role hiera. The RPM ships from artifactapi `rpm-internal` (built on the [vault-plugin-secrets-gpg](https://git.unkin.net/unkin/vault-plugin-secrets-gpg) v0.1.0 tag) and lands the plugin binary in the node's configured `plugin_directory`.
Registering + enabling the secrets backend (`plugin register` / `secrets enable`) is a follow-up terraform-vault change, matching how litellm is wired.
Reviewed-on: #480
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>
unkinben
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