ci(aio): verify that the Lighthouse PWA score remains above a threshold

scripts/ci/env.sh

@@ -58,6 +58,12 @@ if [[ ${TRAVIS:-} ]]; then
     browserstack_optional)
       setEnvVar KARMA_JS_BROWSERS `node -e "console.log(require('/home/travis/build/angular/angular/browser-providers.conf').browserstackAliases.CI_OPTIONAL.join(','))"`
       ;;
+    aio)
+      # Due to network latency/server performance, the min accepted PWA score
+      # on previews is a little lower than on staging.
+      setEnvVar MIN_PWA_SCORE_PREVIEW 93
+      setEnvVar MIN_PWA_SCORE_STAGING 95
+      ;;
   esac
 else
   setEnvVar KARMA_JS_BROWSERS Chrome