In SDK source project, "warning: ignoring the client-specified setting"

When I do this…

git clone https://github.com/digital-asset/daml.git --branch main-2.x

cd daml/sdk

direnv allow

… I see this …

           :
warning: ignoring the client-specified setting 'build-users-group', because it is a restricted setting and you are not a trusted user
warning: ignoring the client-specified setting 'http2', because it is a restricted setting and you are not a trusted user
warning: ignoring the client-specified setting 'keep-derivations', because it is a restricted setting and you are not a trusted user
warning: ignoring the client-specified setting 'keep-outputs', because it is a restricted setting and you are not a trusted user
warning: ignoring untrusted substituter 'https://nix-cache.da-ext.net', you are not a trusted user.
           :

Should I do something to address the above warnings? Or just ignore them?

I’m on MacBook with Apple M1 Pro, direnv 2.34.0, and nix 2.22.1.

Be sure to follow the dev-env setup steps listed in the README, even if you have dev-env already installed. For example…

echo "extra-trusted-users = $USER" | sudo tee -a /etc/nix/nix.conf

HT: @nycnewman