add tests CI

.github/workflow/tests.yml

+name: Tests
+on:
+  push:
+    branches:
+      - master
+jobs:
+  unittests:
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        node-version: [14.x]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up NodeJS
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Install dependencies
+        run: |
+          npm i
+      - name: Run tests
+        run: |
+          ember test
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