Add GitHub action link for Oasis CLI

Author: njelich

docs/README.md

@@ -45,4 +45,5 @@ It boasts a number of handy features:
     calls
   - debugging tools for deployed Wasm contracts
   - inspection of blocks, transactions, results and events
-  
+  - an Oasis CLI [GitHub action](https://github.com/oasisprotocol/setup-cli-action)
+  

docs/setup.mdx

@@ -10,7 +10,8 @@ import TabItem from '@theme/TabItem';
 ## Download and Run
 
 The Oasis team provides CLI binaries for Linux,
-macOS and Windows operating systems.
+macOS and Windows operating systems, as well as 
+a [GitHub Action](https://github.com/oasisprotocol/setup-cli-action) for CI/CD installs.
 If you want to run it on another platform,
 you can [build the CLI from source][cli-source].