Fix missing Bundler in linter workflow by adding gem install bundler step

Co-authored-by: scarlac <[email protected]>

Author: Copilot

.github/workflows/linter.yml

@@ -17,6 +17,10 @@ jobs:
         uses: actions/checkout@v3
       - name: Install modules
         run: yarn
+      - name: Install Bundler
+        run: sudo gem install bundler
+      - name: Install gems
+        run: cd example && sudo bundle install
       - name: Install example
         run: yarn bootstrap-linux
       - name: Lint