fix: nginx setup

web/Dockerfile

@@ -1,10 +1,17 @@
+# Pfad, unter dem die App ausgeliefert wird, z.B. /ue1
+ARG BASE_PATH=/
+
 FROM node:26-trixie-slim AS build
+ARG BASE_PATH
 WORKDIR /app
 COPY package.json package-lock.json ./
 RUN npm ci
 COPY . .
-RUN npm run build
+RUN BASE_PATH="$BASE_PATH" npm run build
 
 FROM nginx:mainline-trixie
+ARG BASE_PATH
 COPY nginx.conf /etc/nginx/conf.d/default.conf
-COPY --from=build /app/dist /usr/share/nginx/html
+# Willkommensseite des Images entfernen
+RUN rm -rf /usr/share/nginx/html/*
+COPY --from=build /app/dist /usr/share/nginx/html/${BASE_PATH}