Add SonarCloud CI workflow configuration

This workflow configures SonarCloud for continuous integration, including steps for frontend and backend dependency installation, testing, and scanning.

Author: Mishaal919

.github/workflows/sonarcloud.yml

@@ -0,0 +1,45 @@
+name: SonarCloud
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  analyze:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Use Node 20
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      # FRONTEND (adjust path if needed)
+      - name: Install FE deps
+        working-directory: frontend
+        run: npm ci
+
+      - name: FE tests (coverage)
+        working-directory: frontend
+        run: npm test -- --coverage --watchAll=false || echo "no FE tests"
+
+      # BACKEND (adjust path if needed)
+      - name: Install BE deps
+        working-directory: backend
+        run: npm ci
+
+      - name: BE tests (coverage)
+        working-directory: backend
+        run: npm test -- --coverage --watchAll=false || echo "no BE tests"
+
+      - name: SonarCloud scan
+        uses: SonarSource/sonarcloud-github-action@v2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}