Merge branch 'master' of https://github.com/fartem/leetcode-ruby into tests-5

Author: fartem

.github/workflows/checks.yml

@@ -83,14 +83,23 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - name: Get changed files
+        id: changed-files
+        uses: tj-actions/changed-files@v39
+        with:
+          files: |
+            **/*.rb
       - name: Set up Ruby
+        if: steps.changed-files.outputs.any_changed == 'true'
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ env.RUBY_VERSION }}
       - name: Install dependencies
+        if: steps.changed-files.outputs.any_changed == 'true'
         run: bundle install
       - name: Run RuboCop
-        run: bundle exec rake rubocop
+        if: steps.changed-files.outputs.any_changed == 'true'
+        run: bundle exec rubocop ${{ steps.changed-files.outputs.all_changed_files }}
 
   tests:
     permissions: write-all