ci: fix static analysis job

Author: DannyBen

.github/workflows/test.yml

@@ -49,6 +49,16 @@ jobs:
     - name: Install shfmt
       run: rush snatch dannyben shfmt
 
+    # libyaml needed for Ruby's YAML library
+    - name: Install OS dependencies
+      run: sudo apt-get -y install libyaml-dev
+
+    - name: Setup Ruby
+      uses: ruby/setup-ruby@v1
+      with: 
+        ruby-version: '3.1'
+        bundler-cache: true
+
     - name: Run shellcheck tests
       run: bundle exec run shellcheck