ci(aio): add monitoring for angular.io (#22483)

This commit configures a periodic job to be run on CircleCI, performing several
checks against the actual apps deployed to production (https://angular.io) and
staging (https://next.angular.io).

Fixes #21942

PR Close #22483

aio/scripts/test-production.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set +x -eu -o pipefail
+
+(
+  readonly thisDir="$(cd $(dirname ${BASH_SOURCE[0]}); pwd)"
+  readonly aioDir="$(realpath $thisDir/..)"
+
+  readonly appPtorConf="$aioDir/tests/e2e/protractor.conf.js"
+  readonly cfgPtorConf="$aioDir/tests/deployment-config/e2e/protractor.conf.js"
+  readonly minPwaScore="95"
+  readonly urls=(
+    "https://angular.io/"
+    "https://next.angular.io"
+  )
+
+  cd "$aioDir"
+
+  # Install dependencies.
+  echo -e "\nInstalling dependencies in '$aioDir'...\n-----"
+  yarn install --frozen-lockfile
+  yarn update-webdriver
+
+  # Run checks for all URLs.
+  for url in "${urls[@]}"; do
+    echo -e "\nChecking '$url'...\n-----"
+
+    # Run e2e tests.
+    yarn protractor "$appPtorConf" --baseUrl "$url"
+
+    # Run deployment config tests.
+    yarn protractor "$cfgPtorConf" --baseUrl "$url"
+
+    # Run PWA-score tests.
+    yarn test-pwa-score "$url" "$minPwaScore"
+  done
+
+  echo -e "\nAll checks passed!"
+)