Install and setup Google Lighthouse CI

.github/workflows/lighthouse.yml

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+name: Lighthouse CI
+on: [push, pull_request]
+
+jobs:
+  lighthouse:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+          run_install: false
+
+      - name: Get pnpm store directory
+        shell: bash
+        run: |
+          echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_ENV
+
+      - name: Setup pnpm cache
+        uses: actions/cache@v4
+        with:
+          path: ${{ env.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-store-
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Build project
+        env:
+          NEXT_PUBLIC_GRAPHQL_URL: "https://swewoocommerce.dfweb.no/graphql"
+          NEXT_PUBLIC_PLACEHOLDER_SMALL_IMAGE_URL: "https://via.placeholder.com/200"
+          NEXT_PUBLIC_PLACEHOLDER_LARGE_IMAGE_URL: "https://via.placeholder.com/600"
+        run: pnpm build
+
+      - name: Start server
+        env:
+          NEXT_PUBLIC_GRAPHQL_URL: "https://swewoocommerce.dfweb.no/graphql"
+          NEXT_PUBLIC_PLACEHOLDER_SMALL_IMAGE_URL: "https://via.placeholder.com/200"
+          NEXT_PUBLIC_PLACEHOLDER_LARGE_IMAGE_URL: "https://via.placeholder.com/600"
+        run: |
+          pnpm start &
+          echo "Waiting for server to be ready..."
+          while ! nc -z localhost 3000; do
+            sleep 5
+          done
+          # Additional wait to ensure full initialization
+          sleep 20
+
+      - name: Run Lighthouse CI
+        run: |
+          pnpm lhci:perf
+          pnpm lhci:desktop
+        env:
+          LHCI_GITHUB_APP_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Stop server
+        if: always()
+        run: |
+          pkill -f "next start" || true

lighthouserc.json

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+{
+  "ci": {
+    "collect": {
+      "numberOfRuns": 1,
+      "url": [
+        "http://localhost:3000/",
+        "http://localhost:3000/produkter",
+        "http://localhost:3000/kategorier"
+      ],
+      "port": 3000,
+      "settings": {
+        "onlyCategories": [
+          "performance",
+          "accessibility",
+          "best-practices",
+          "seo"
+        ],
+        "skipAudits": ["uses-http2"]
+      }
+    },
+    "upload": { "target": "temporary-public-storage" },
+    "assert": {
+      "assertions": {
+        "categories:performance": ["warn", { "minScore": 0.6 }],
+        "categories:accessibility": ["warn", { "minScore": 0.9 }],
+        "categories:best-practices": ["warn", { "minScore": 0.9 }],
+        "categories:seo": ["warn", { "minScore": 0.9 }],
+        "uses-http2": "off"
+      }
+    }
+  }
+}