message: docs: add "package role" to CLI glossary
diff: @@ -50,3 +50,4 @@ improve the tooling, as well as to more easily keep the system up to date.
  - **Bundle** - A collection of the deployment artifacts. The output of the
  bundling process, which brings a collection of packages into a single
  collection of deployment artifacts.
  +- **Package Role** - The declared role of a package, see [package roles](./cli-build-system#package-roles).
  