Add test and build actions

Author: Yukaii

.github/workflows/build.yml

@@ -0,0 +1,28 @@
+name: 'Test and Build'
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  test-and-build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - uses: actions/cache@v2
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-node-
+
+    - uses: actions/setup-node@v2
+      with:
+        node-version: '12'
+        check-latest: true
+
+    - run: npm ci
+    - run: npm run test:ci
+    - run: npm run build