message: build: fix env passing to webpack
diff: "dev": "webpack serve --mode=development",
  "release": "bash scripts/release.sh",
  "changelog": "conventional-changelog -p angular -i CHANGELOG.md -s -r 1",
  - "build:playground": "webpack --env.prod",
  - "build:e2e": "webpack --env.prod --config e2e/webpack.config.js",
  + "build:playground": "webpack --env prod",
  + "build:e2e": "webpack --env prod --config e2e/webpack.config.js",
  "build:size": "yarn run build && rollup -c size-checks/rollup.config.js",
  "dev:e2e": "webpack serve --mode=development --config e2e/webpack.config.js",
  "docs": "vitepress dev docs",
  