[test] Add codesandbox-ci

.codesandbox/.ci.json

@@ -0,0 +1,21 @@
+{
+  "buildCommand": "build:codesandbox",
+  "packages": [
+    "packages/x-license",
+    "packages/grid/data-grid",
+    "packages/grid/x-grid",
+    "packages/grid/x-grid-data-generator"
+  ],
+  "publishDirectory": {
+    "@material-ui/x-license": "packages/x-license",
+    "@material-ui/data-grid": "packages/material-ui-icons",
+    "@material-ui/x-grid": "packages/grid/x-grid",
+    "@material-ui/x-grid-data-generator": "packages/grid/x-grid-data-generator"
+  },
+  "sandboxes": [
+    "new",
+    "github/mui-org/material-ui/tree/master/examples/create-react-app",
+    "github/mui-org/material-ui/tree/master/examples/create-react-app-with-typescript"
+  ],
+  "silent": true
+}

package.json

@@ -12,6 +12,7 @@
     "storybook:build": "yarn workspace storybook build",
     "storybook:export": "yarn workspace storybook export",
     "deduplicate": "node scripts/deduplicate.js",
+    "build:codesandbox": "yarn lerna:build",
     "prettier": "yarn babel-node -i '/node_modules/(?!@material-ui)/' ./scripts/prettier.js --branch master",
     "test": "lerna run test --parallel",
     "test:coverage": "cross-env NODE_ENV=test BABEL_ENV=coverage nyc mocha 'packages/**/*.test.tsx' --exclude '**/node_modules/**' && nyc report -r lcovonly",