Added CI action for running tests.

.github/workflows/run-tests.yaml

@@ -0,0 +1,34 @@
+on:
+  push:
+    paths-ignore:
+      - README.md
+    branches:
+      - master
+  pull_request:
+    paths-ignore:
+      - README.md
+
+name: Run tests
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Set up Node
+      uses: actions/setup-node@v2
+      with:
+        node-version: 20
+
+    - name: Restore the node modules
+      uses: actions/cache@v3
+      with:
+        path: '**/node_modules'
+        key: modules-${{ hashFiles('**/package.json') }}
+
+    - name: Install packages
+      run: npm i --include-dev
+
+    - name: Run tests
+      run: npm run test