Add NEXT_PUBLIC_API_URL build arg to web-ui Dockerfile

services/web-ui/Dockerfile

@@ -9,7 +9,12 @@ FROM base AS builder
 WORKDIR /app
 COPY --from=deps /app/node_modules ./node_modules
 COPY . .
+
+# Build-time env for Next.js public vars
+ARG NEXT_PUBLIC_API_URL=http://localhost:8001
+ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}
 ENV NEXT_TELEMETRY_DISABLED=1
+
 RUN npm run build
 
 FROM base AS runner