Hide bundler post-install messages (#815)

* Hide bundler post-install messages

These may be useful in dev but in CI they're noisy

.github/workflows/build.yml

@@ -27,6 +27,7 @@ jobs:
           rm -f ${GITHUB_WORKSPACE}/Gemfile.lock
       - name: Run Tests
         run: |
-          bundle config set with docs
+          bundle config set --with docs
+          bundle config set ignore_messages true
           bundle
           bundle exec rake test