chore(ci): Use Turborepo for CI pipeline QA caching

.gitea/workflows/deploy.yml

@@ -171,15 +171,19 @@ jobs:
           echo "//${{ vars.REGISTRY_HOST || 'npm.infra.mintel.me' }}/:_authToken=${{ secrets.REGISTRY_PASS }}" >> .npmrc
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
+      - name: Setup Turbo cache
+        uses: actions/cache@v4
+        with:
+          path: .turbo
+          key: ${{ runner.os }}-turbo-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-turbo-
+
       - name: 🔒 Security Audit
         run: pnpm audit --audit-level high
       - name: 🧪 QA Checks
         if: github.event.inputs.skip_checks != 'true'
-        run: |
-          pnpm lint
-          pnpm check:spell
-          pnpm typecheck
-          pnpm test
+        run: npx turbo run lint check:spell typecheck test
 
   # ──────────────────────────────────────────────────────────────────────────────
   # JOB 3: Build & Push