feat: added build step nad upped node version to PR workflow

Author: jerzy-mankowski

.github/workflows/pull-request.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '16.x'
+          node-version: '18.x'
           cache: 'npm'
 
       - name: Installing dependencies
@@ -26,3 +26,5 @@ jobs:
       - name: Running typecheck
         run: npm run typecheck
 
+      - name: Running build
+        run: npm run build