Merge pull request #23442 from backstage/emmablam/a18yfix

A11Y: Fix lighthouse check with new auth system

.lighthouseci/scripts/guest-auth.js

@@ -7,5 +7,4 @@ module.exports = async (browser, context) => {
   await page.evaluate(() => {
     localStorage.setItem('@backstage/core:SignInPage:provider', 'guest');
   });
-  await page.goto('http://localhost:3000');
 };

lighthouserc.js

@@ -52,7 +52,7 @@ module.exports = {
         outputPath: './.lighthouseci/reports',
         preset: 'desktop',
       },
-      startServerCommand: 'yarn dev',
+      startServerCommand: 'yarn start:lighthouse',
       startServerReadyPattern: 'webpack compiled successfully',
       startServerReadyTimeout: 600000,
       numberOfRuns: 1,
@@ -64,7 +64,7 @@ module.exports = {
         'categories:pwa': 'off',
         'categories:best-practices': 'off',
         'categories:seo': 'off',
-        'categories:accessibility': ['error', { minScore: 0.89 }],
+        'categories:accessibility': ['error', { minScore: 0.95 }],
       },
     },
   },

package.json

@@ -42,6 +42,7 @@
     "start": "yarn workspace example-app start",
     "start-backend": "yarn workspace example-backend start",
     "start-backend:next": "yarn workspace example-backend-next start",
+    "start:lighthouse": "concurrently 'yarn start' 'yarn start-backend:next'",
     "start:microsite": "cd microsite/ && yarn start",
     "start:next": "yarn workspace example-app-next start",
     "storybook": "yarn ./storybook run start",