ci: add GitHub Packages auth for private dependency

.github/workflows/server-ci.yml

@@ -27,9 +27,13 @@ jobs:
         with:
           node-version: '20'
           cache: 'npm'
+          registry-url: 'https://npm.pkg.github.com'
+          scope: '@boudra'
 
       - name: Install dependencies
         run: npm ci
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Typecheck
         run: npm run typecheck --workspace=@paseo/server