Update dockerfile and add gitignore

dockerfile

@@ -1,5 +1,5 @@
-# Use the official Bun image
-FROM oven/bun:1 AS base
+# Use the official Node.js image
+FROM node:18 AS base
 WORKDIR /usr/src/app
 
 # Install dependencies into temp directories
@@ -7,26 +7,26 @@ WORKDIR /usr/src/app
 FROM base AS install
 
 # Install dependencies for both backend and frontend
-COPY backend/package.json backend/bun.lockb /temp/dev/backend/
-COPY frontend/package.json frontend/bun.lockb /temp/dev/frontend/
+COPY backend/package.json backend/package-lock.json /temp/dev/backend/
+COPY frontend/package.json frontend/package-lock.json /temp/dev/frontend/
 
-RUN cd /temp/dev/backend && bun install
-RUN cd /temp/dev/frontend && bun install
+RUN cd /temp/dev/backend && npm install
+RUN cd /temp/dev/frontend && npm install
 
 # Install with --production (exclude devDependencies)
 RUN mkdir -p /temp/prod/backend /temp/prod/frontend
-COPY backend/package.json backend/bun.lockb /temp/prod/backend/
-COPY frontend/package.json frontend/bun.lockb /temp/prod/frontend/
+COPY backend/package.json backend/package-lock.json /temp/prod/backend/
+COPY frontend/package.json frontend/package-lock.json /temp/prod/frontend/
 
-RUN cd /temp/prod/backend && bun install
-RUN cd /temp/prod/frontend && bun install
+RUN cd /temp/prod/backend && npm install --production
+RUN cd /temp/prod/frontend && npm install --production
 
 # Build the frontend project
 FROM install AS build-frontend
 WORKDIR /usr/src/app/frontend
 COPY --from=install /temp/dev/frontend/node_modules node_modules
 COPY frontend/ .
-RUN bun run build
+RUN npm run build
 
 # Prepare for final release
 FROM base AS release
@@ -43,6 +43,7 @@ COPY backend/ backend/
 COPY --from=build-frontend /usr/src/app/frontend/dist backend/public
 
 # Set the entrypoint to run the backend server
-USER bun
+USER node
+WORKDIR /usr/src/app/backend
 EXPOSE 3000/tcp
-ENTRYPOINT [ "bun", "run", "backend/src/server.ts" ]
+ENTRYPOINT [ "npm", "run", "start"]