Playground publish script.

.github/workflows/playground.yml

@@ -0,0 +1,26 @@
+name: Release
+on:
+    push:
+        branches:
+            - master
+jobs:
+    release:
+        name: Release
+        runs-on: ubuntu-18.04
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v1
+            - name: Setup Node.js
+              uses: actions/setup-node@v1
+              with:
+                  node-version: 12
+            - name: Install dependencies
+              run: yarn install
+            - name: Build
+              run: yarn build
+            - name: Publish github pages
+              run: |
+                  git remote set-url origin https://git:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git
+                  yarn workspace playground run pub
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}