fix(dre): asking for update everywhere

[NikolaMilosa]

With this fix we will be able to:

1. Automatically reject upgrades if stdin is not a tty (useful if running in docker container)
   To test this you can run:

echo "test" | dre registry

2. Set an environment variable to skip the check (useful if running in some scripts that are still run from terminal)
   To test this you can run:

DRE_REFUSE_UPDATE=1 dre registry

[DFINITYManu]

This is good but it still won't fix the problem of running on a script in a terminal breaking if an update is published.

Please let's get that fixed too.

[NikolaMilosa]

If you have it wrapped in a script, you can add the environment variable and it will skip the check. Why is that not enough?