Add bundle to ruby env

Author: joemsak

.github/workflows/tests.yml

@@ -20,6 +20,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.7
+        run: gem install bundler -v 2.4.22 && bundle install
 
       - name: Install Docker and Docker Compose
         run: |