add rg to github CI

Author: obie

.github/workflows/ci.yaml

@@ -21,6 +21,8 @@ jobs:
     continue-on-error: ${{ matrix.ruby == 'ruby-head' }}
     steps:
       - uses: actions/checkout@v4
+      - name: Install ripgrep
+        run: sudo apt-get update && sudo apt-get install -y ripgrep
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}