Build at runtime so env vars work

Dockerfile

@@ -1,28 +1,26 @@
 # syntax=docker/dockerfile:1
 
-# ---- Build stage: compile the Vite/SolidJS app to static files ----
-FROM node:24-alpine AS build
+# Single stage: the Vite/SolidJS app is built at *container start* rather than at
+# image build, so VITE_* env vars passed to `docker run` are inlined into the bundle.
+FROM node:24-alpine
 WORKDIR /app
 
 # pnpm ships with Node via corepack; pin to the version that produced pnpm-lock.yaml.
 RUN corepack enable && corepack prepare pnpm@10.33.0 --activate
 
+# `serve` (what `npx serve` runs) — installed now so the image is self-contained.
+RUN npm install -g serve@14
+
 # Install deps first so this layer is cached unless the manifest/lockfile change.
+# devDependencies are kept because the build runs at container start.
 COPY package.json pnpm-lock.yaml ./
 RUN pnpm install --frozen-lockfile
 
-# Build (`tsc && vite build` → /app/dist). devDependencies are needed here.
+# App source. The build itself is deferred to the CMD below.
 COPY . .
-RUN pnpm build
-
-# ---- Serve stage: static files via `serve` ----
-FROM node:24-alpine AS serve
-WORKDIR /app
-
-# `serve` (what `npx serve` runs) — installed at build time so the image is self-contained.
-RUN npm install -g serve@14
-
-COPY --from=build /app/dist ./dist
 
 EXPOSE 3000
-CMD ["serve", "-s", "dist", "-l", "3000"]
+
+# Build (`tsc && vite build` → /app/dist) at runtime so VITE_* vars from the
+# environment configure the app, then serve the static output.
+CMD pnpm build && serve -s dist -l 3000