Support suppressing "A new version of Supabase CLI is available" message

[brandonchinn178]

Existing issues

• I have searched the existing issues.

Affected area

Other

Problem to solve

I'm using supabase from Nix. I want to suppress the message suggesting upgrading because I'm intentionally using the version pinned in Nix.

Proposed solution

Add an environment variable to avoid checking for upgrade

Alternatives considered

No response

Additional context

No response