Do Node stuff as part of Github build

So I don't forget to do it locally

.github/workflows/main_seattle-carsinbikelanes.yml

@@ -21,6 +21,19 @@ jobs:
         with:
           dotnet-version: '8.0.x'
 
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 'lts/*'
+
+      - name: Install npm dependencies
+        working-directory: SeattleCarsInBikeLanes
+        run: npm install
+
+      - name: Run webpack
+        working-directory: SeattleCarsInBikeLanes
+        run: npx webpack
+
       - name: Build with dotnet
         run: dotnet build SeattleCarsInBikeLanes/SeattleCarsInBikeLanes.csproj --configuration Release