refactor: :recycle: bun-based dockerfile

Dockerfile

@@ -1,14 +1,14 @@
 # syntax=docker/dockerfile:1
 
-FROM node:alpine as build
+FROM oven/bun:latest as build
 
 WORKDIR /app
 
 COPY package.json package-lock.json ./ 
-RUN npm ci
-
 COPY . .
-RUN npm run build
+
+RUN bun install
+RUN bun run build
 
 FROM python:3.11-slim-buster as base
 
@@ -32,4 +32,4 @@ RUN pip3 install -r requirements.txt
 
 COPY ./backend .
 
-CMD [ "sh", "start.sh"]
+CMD [ "sh", "start.sh"]