[feature-request]: use better managment for env

[Clumsy-Coder]

Is your feature related to a problem?

I want to be able to see which envs are missing when starting the nextjs app.

Be able to exit the program if an env is missing

Describe the new feature

• To run some kind of code before building the app to check if all the required envs are present. Exit otherwise

• Setup linter rules to prevent accessing the env directly (ex: `process.env.DATABASE_URL)

• be able to use it in docker compose (later)

Additional context

• check t3-env
  • https://youtu.be/dLRKV-bajS4?t=3958&si=gxmscFY1W9mhSpD0
  • https://youtu.be/dLRKV-bajS4?t=4301&si=pKm4ovOSjjXmkr_L
• example repo
  • https://github.com/w3cj/next-start
• docker compose
  • https://youtu.be/dLRKV-bajS4?t=6191&si=1QgXKhXwM4Aq13Y3