chore: update docker file, move to 20-alpine

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:20-bullseye
+FROM node:20-alpine
 
 WORKDIR /app/tianji
 
@@ -6,13 +6,16 @@ RUN npm install -g pnpm@8.3.1
 
 COPY . .
 
-# Push client(only support pure text message)
-RUN apt update && apt -y install apprise
+RUN apk add --update --no-cache python3 g++ make py3-pip
 
 RUN pnpm install --frozen-lockfile
 
 RUN pnpm build
 
+# make sure run after pnpm build completed
+# Push client(only support pure text message)
+RUN pip install apprise --break-system-packages
+
 # remove unused source file
 RUN rm -rf ./src
 RUN rm -rf ./website