add github test action

Author: MattKiazyk

.github/workflows/tests.yml

@@ -0,0 +1,29 @@
+name: Tests
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: tests-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    name: Swift Package Tests
+    runs-on: macos-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Show Swift version
+        run: swift --version
+
+      - name: Resolve dependencies
+        run: swift package resolve
+
+      - name: Run tests
+        run: swift test --parallel