add test workflow to run on push

.github/workflows/test.yml

+name: Test
+on: push
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Setup Deno
+        uses: denolib/setup-deno@v2
+        with:
+            deno-version: v1.x
+      - name: Install dependencies
+        run: |
+          npm ci
+          npm run build --if-present
+      - name: Run tests
+        run: |
+          npm run test
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