add testing github action

.github/workflows/publish-main.yml

@@ -1,4 +1,4 @@
-name: Publish (main)
+name: Publish
 
 on:
   release:

.github/workflows/tests.yml

@@ -0,0 +1,21 @@
+name: Tests
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: latest
+          registry-url: https://registry.npmjs.org/
+      - name: Install dependencies
+        run: npm ci
+      - name: Run tests
+        run: npm test