change npm to pnpm in dockerfile and readme

Dockerfile

@@ -4,11 +4,13 @@ WORKDIR "/app"
 
 COPY . .
 
-RUN npm ci
+RUN npm i -g pnpm
 
-RUN npm run build
+RUN pnpm i
 
-RUN npm prune --production
+RUN pnpm build
+
+RUN pnpm prune --production
 
 FROM node:18-alpine AS prod
 

README.md

@@ -11,7 +11,7 @@ Basic leaderboard api using next js, mariadb and typescript.
 ## Deployment
 
 - Copy `.env.example` to `.env`, and add relevant information
-- `npm run ci`
-- `npm run build`
-- `npm prune --production`
-- `npm start:prod --host 0.0.0.0`
+- `pnpm run i`
+- `pnpm run build`
+- `pnpm prune --production`
+- `pnpm start:prod --host 0.0.0.0`