[Bug]: Mistake in production dockerfile using yarn

[tanmayvaij]

Link to the documentation page or resource

https://docs.strapi.io/dev-docs/installation/docker#production-dockerfile

Describe the bug

In the snippet of ./Dockerfile.prod, its mentioned ENV NODE_ENV=production, it shoud be ARG NODE_ENV=production

# Creating multi-stage build for production
FROM node:18-alpine as build
RUN apk update && apk add --no-cache build-base gcc autoconf automake zlib-dev libpng-dev vips-dev git > /dev/null 2>&1
ENV NODE_ENV=production
ENV NODE_ENV=${NODE_ENV}

Additional context

No response

Suggested improvements or fixes

No response

Related issue(s)/PR(s)

No response