Add workflow to run Sorbet type checker

.github/workflows/run_tests.yml

@@ -0,0 +1,26 @@
+name: Run tests
+
+on:
+  push:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  run-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+          ruby-version: ruby
+
+      - name: Install dependencies
+        run: bundle install
+
+      - name: Check types
+        run: bundle exec srb tc