feat(ci): add the simplest test.yml workflow for CI

Signed-off-by: Kipras Melnikovas <kipras@kipras.org>

Author: kiprasmel

.github/workflows/test.yml

@@ -0,0 +1,16 @@
+name: "tests"
+
+on: [push, workflow_dispatch]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: "12"
+      - run: yarn --frozen-lockfile
+      - run: yarn test
+