Add build action to run tests

.github/workflows/build.yml

@@ -0,0 +1,25 @@
+name: Build
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: '0'
+      - name: Install
+        uses: jetli/[email protected]
+        with:
+          version: 'latest'
+      - name: Build
+        run: |
+          rustup default nightly
+          wasm-pack build --release
+      - name: Test
+        run: wasm-pack test --headless --firefox