test: percy visual testing (#1053)

* test: percy visual testing init

* Try PR checks with custom command

* Only run percy visual tests for PWA on merge for now

package.json

@@ -26,6 +26,7 @@
     "test:unit": "jest --collectCoverage",
     "test:unit:ci": "lerna run test:unit:ci --parallel --stream",
     "test:e2e": "lerna run test:e2e --stream",
+    "test:e2e:ci": "lerna run test:e2e:ci --stream",
     "test:e2e:dist": "lerna run test:e2e:dist --stream",
     "test:e2e:serve": "lerna run test:e2e:serve --stream",
     "see-changed": "lerna changed",
@@ -49,6 +50,7 @@
     "@babel/plugin-transform-runtime": "^7.5.0",
     "@babel/preset-env": "^7.5.0",
     "@babel/preset-react": "^7.0.0",
+    "@percy/cypress": "^2.2.0",
     "babel-eslint": "9.x",
     "babel-loader": "^8.0.6",
     "babel-plugin-inline-react-svg": "1.1.0",
@@ -57,6 +59,7 @@
     "copy-webpack-plugin": "^5.0.3",
     "cross-env": "^5.2.0",
     "css-loader": "^3.2.0",
+    "dotenv": "^8.1.0",
     "eslint": "5.16.0",
     "eslint-config-react-app": "^4.0.1",
     "eslint-plugin-flowtype": "2.x",