Only build assets and packages on e2e tests

.travis.yml

@@ -33,8 +33,7 @@ jobs:
     php: 7.4
     env: WP_VERSION=latest WP_MULTISITE=0 RUN_E2E=1
     script:
-      - composer require wp-cli/i18n-command
-      - npm run build:core
+      - npm run build:assets
       - npm run build:packages
       - npm install jest --global
       - npm run docker:up

package.json

@@ -18,6 +18,7 @@
     "build-watch": "grunt watch",
     "build:packages": "lerna run build",
     "build:zip": "npm run build && composer install && npm run build:core",
+    "build:assets": "grunt assets",
     "lint:js": "eslint assets/js --ext=js",
     "docker:up": "npm explore @woocommerce/e2e-environment -- npm run docker:up",
     "docker:down": "npm explore @woocommerce/e2e-environment -- npm run docker:down",