build: use domestic package registries

backend/Dockerfile

@@ -6,7 +6,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 
 WORKDIR /app
 COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
+ARG PIP_INDEX_URL=https://pypi.tuna.tsinghua.edu.cn/simple
+RUN pip install --no-cache-dir --index-url "$PIP_INDEX_URL" -r requirements.txt
 
 COPY . .
 

frontend/Dockerfile

@@ -3,7 +3,8 @@ FROM node:20-alpine AS builder
 
 WORKDIR /app
 COPY package.json ./
-RUN npm install
+ARG NPM_REGISTRY=https://registry.npmmirror.com
+RUN npm config set registry "$NPM_REGISTRY" && npm install
 COPY . .
 RUN npm run build