Add deploy CI (#8)

.github/workflows/deploy.yml

@@ -0,0 +1,27 @@
+name: Deploy
+
+on:
+  push:
+    branches: [docs]
+  pull_request:
+    branches: [docs]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [16.x]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: pnpm/action-setup@v2
+        with:
+          version: 8.15.3
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: "pnpm"
+      - run: pnpm install
+      - run: pnpm run prepublishOnly
+      - run: pnpm run docs:build
+      - run: pnpm run docs:deploy