chore: add deploy workflow

.github/workflows/main.yml

@@ -85,3 +85,44 @@ jobs:
           GIT_COMMITTER_NAME: ${{ secrets.GIT_AUTHOR_NAME }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+
+  demo:
+    if: github.event_name == 'push' && github.ref == 'master'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Get yarn cache directory path
+        id: init
+        shell: bash
+        run: |
+          echo "::set-output name=yarn_cache::$(yarn cache dir)"
+          #
+          echo "Node $(node --version)"
+          echo "Yarn $(yarn --version)"
+      - uses: actions/checkout@v2
+
+      - name: Cache Yarn packages
+        id: yarn_cache_packages
+        uses: actions/cache@v1
+        with:
+          path: ${{ steps.init.outputs.yarn_cache }}
+          key: ${{ runner.os }}-yarn_cache-${{ hashFiles('yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn_cache-
+      - name: Cache node_modules
+        uses: actions/cache@v1
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-${{ matrix.node-version }}-yarn-${{ hashFiles('yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-${{ matrix.node-version }}-yarn-
+
+      - name: Installing
+        run: yarn --frozen-lockfile --perfer-offline --link-duplicates
+
+      - name: Deploy demo
+        run: yarn deploy