Dockerize SvelteKit app for nodejs

Dockerfile

FROM node:20.2.0-bullseye-slim AS build

WORKDIR /app

COPY . .
RUN npm install

RUN npm run build

# ---
FROM node:20.2.0-bullseye-slim AS package

WORKDIR /app

COPY package.json .
COPY package-lock.json .
RUN npm ci --production

# ---
FROM node:20.2.0-bullseye-slim

WORKDIR /app
COPY --from=build /app/build build/
COPY --from=package /app/node_modules node_modules/
COPY package.json .

CMD [ "node", "build" ]