add workflow to run test on PR's and push to main branch

.github/workflows/test.yml

@@ -0,0 +1,22 @@
+name: Run test for dmX on push to main and PR's
+on:
+    push:
+        branches: [main]
+    pull_request:
+        types: [opened, reopened, synchronize]
+
+jobs:
+    test:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - name: Use Node.js
+              uses: actions/setup-node@v4
+              with:
+                  node-version: "20.x"
+                  cache: "npm"
+            - name: Install dependencies
+              run: npm install
+            - name: Run tests
+              run: npm test