add testing pipeline

Author: adrianthedev

.github/workflows/testing.yml

@@ -0,0 +1,36 @@
+name: Testing
+on: [push, pull_request]
+jobs:
+  rubocop:
+    name: Rubocop
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.3"
+          bundler-cache: true
+      - name: Run Rubocop
+        run: bundle exec standardrb
+
+  tests:
+    name: Tests (Ruby ${{ matrix.ruby }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby:
+          - "3.1"
+          - "3.2"
+          - "3.3"
+          - "3.4"
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Ruby ${{ matrix.ruby }}
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+      - name: Run tests
+        run: bundle exec rake test