[ELITERT-1198] Add action to run Ruby linters

The action runs the Ruby linters (Rubocop and Reek) on Pull Requests.

.github/workflows/ruby-linters.yml

@@ -0,0 +1,31 @@
+# This workflow runs Rubocop and Reek on the Pull Requests to make sure
+# no linter warnings slip by.
+
+name: Ruby Linters
+
+on:
+  pull_request:
+    branches: [ "master" ]
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: ['2.7']
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - name: Run Rubocop
+      uses: reviewdog/[email protected]
+    - name: Run Reek
+      uses: reviewdog/[email protected]