docs(): add reference to GitHub action

Author: njelich

docs/rofl/workflow/prerequisites.mdx

@@ -101,3 +101,8 @@ accounts.
    corresponding libraries.
 
 [Oasis Core prerequisites]: https://github.com/oasisprotocol/oasis-core/blob/master/docs/development-setup/prerequisites.md
+
+### Other: GitHub Action Install
+
+The Oasis CLI can also be installed in CI/CD workflows using the Oasis provided
+[GitHub Action](https://github.com/oasisprotocol/setup-cli-action).