chore(ui): test build container image on pull request (#6849)

.github/workflows/ui-pull-request.yml

@@ -13,6 +13,9 @@ on:
       - "v5.*"
     paths:
       - 'ui/**'
+env:
+  UI_WORKING_DIR: ./ui
+  IMAGE_NAME: prowler-ui
 
 jobs:
   test-and-coverage:
@@ -39,3 +42,19 @@ jobs:
       - name: Build the application
         working-directory: ./ui
         run: npm run build
+  test-container-build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build Container
+        uses: docker/build-push-action@v6
+        with:
+          context: ${{ env.UI_WORKING_DIR }}
+          # Always build using `prod` target
+          target: prod
+          push: false
+          tags: ${{ env.IMAGE_NAME }}:latest
+          outputs: type=docker
+          build-args: |
+            NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY=pk_test_51LwpXXXX