ci: add lighthouse accessibility testing job (#85)

Author: rshigg

.github/workflows/ci.yml

@@ -73,3 +73,25 @@ jobs:
 
       - name: 🖥️ Test project (browser)
         run: pnpm test:browser
+
+  a11y:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v6
+      - run: corepack enable
+      - uses: actions/setup-node@v6
+        with:
+          node-version: lts/*
+          cache: pnpm
+
+      - name: 📦 Install dependencies
+        run: pnpm install
+
+      - name: 🏗️ Build project
+        run: pnpm build
+
+      - name: ♿ Accessibility audit (Lighthouse)
+        run: pnpx @lhci/cli autorun
+        env:
+          LHCI_GITHUB_APP_TOKEN: ${{ secrets.LHCI_GITHUB_APP_TOKEN }}

.gitignore

@@ -33,3 +33,6 @@ coverage/
 # Playwright
 playwright-report/
 test-results/
+
+# Lighthouse
+.lighthouseci

.lighthouserc.json

@@ -0,0 +1,26 @@
+{
+  "ci": {
+    "collect": {
+      "startServerCommand": "pnpm preview",
+      "startServerReadyPattern": "Listening",
+      "url": [
+        "http://localhost:3000/",
+        "http://localhost:3000/search?q=nuxt",
+        "http://localhost:3000/nuxt"
+      ],
+      "numberOfRuns": 1,
+      "settings": {
+        "onlyCategories": ["accessibility"],
+        "skipAudits": ["valid-source-maps"]
+      }
+    },
+    "assert": {
+      "assertions": {
+        "categories:accessibility": ["warn", { "minScore": 0.9 }]
+      }
+    },
+    "upload": {
+      "target": "temporary-public-storage"
+    }
+  }
+}