chore: add tests workflow

.gitea/workflows/run-tests.yaml

@@ -0,0 +1,16 @@
+name: Run tests
+on:
+  push:
+
+jobs:
+  test-project:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v5
+      - name: Setup ruby
+        uses: ruby/setup-ruby
+      - name: Install dependencies
+        run: bundle install
+      - name: Run tests
+        run: bundle exec rake