Add requirement for frontend to finish

.github/workflows/build_and_test.yml

@@ -142,7 +142,7 @@ jobs:
   test-backend:
     name: Test backend
     runs-on: ubuntu-latest
-    needs: build-backend
+    needs: [build-backend, frontend]
     steps:
       - name: Checking out repository
         uses: actions/checkout@v4
@@ -173,6 +173,10 @@ jobs:
       - name: Setup Graphviz
         uses: ts-graphviz/setup-graphviz@v2
 
+      - name: Get frontend artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: frontend-${{ github.sha }}
       - name: Setup ViaspDash
         shell: bash -l {0}
         run: |