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您啟動的伺服器似乎不是網頁伺服器，看起來只監聽在本機 (localhost) 上，需要將 listen host 改到 0.0.0.0 才能從外網存取。

您可以試試看按照 Expo 官方的 Dockerfile 案例進行微調：https://github.com/expo-starter/expo-self-host-with-docker/blob/main/Dockerfile

FROM node:20-alpine AS base

FROM base AS builder

RUN apk add --no-cache gcompat
WORKDIR /app

COPY . ./

RUN npm ci && \
 npm run export && \
 npm prune --production

FROM base AS runner
WORKDIR /app

RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nodejs

RUN npm install express compression morgan @expo/server
COPY --from=builder --chown=nodejs:nodejs /app/dist /app/dist
COPY --from=builder --chown=nodejs:nodejs /app/server.js /app/server.js

USER nodejs
EXPOSE 3000

CMD ["node", "/app/server.js"]

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