Creates the two Gitea repositories backing the new Rancher token secrets engine:
a Vault/OpenBao plugin and its Terraform provider.
- Add config/git.unkin.net/unkin/repository/vault-plugin-secrets-rancher.yaml
(squash-only, main protected on pre-commit/build/test).
- Add config/git.unkin.net/unkin/repository/terraform-provider-ranchervaultsecret.yaml
(same protection profile as the litellm provider repo).