Add a GitHub action to run all tests on push

Author: CarlosCD

.github/workflows/run_tests.yml

@@ -0,0 +1,15 @@
+name: Run Tests
+on: [ push ]
+jobs:
+  run_tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: .ruby-version
+          bundler-cache: true
+      - name: Run specs
+        run: rake