fix: korrigiere workflow syntax

Reviewed-on: #1

.gitea/workflows/staging.yaml

@@ -7,6 +7,9 @@ on:
 jobs:
   build:
     runs-on: webserver
+    defaults:
+      run:
+        working-directory: shop
     steps:
       - name: Code auschecken
         uses: actions/checkout@v4
@@ -15,4 +18,6 @@ jobs:
         run: npm install
 
       - name: Staging-Build generieren
-        run: npm run build -- --configuration=staging
+        env:
+          NODE_ENV: development
+        run: npm run build