This may put the token world readable in the corresponding .drv file.

Our use case is providing token from environment variable like:

token = builtins.getEnv "GITLAB_PERSONAL_ACCESS_TOKEN";

Does this protect the token from the world?

I would appreciate some instructions how this should be implemented here.

Passing environment variables is unlikely to work because of the sandbox.
Even if you disable the sandbox, the build is executed by the daemon, not by the nix-build process for which you set the environment variable.
Also if you do so, anyone with enough privileges to run builds can leak the environment variable.
No security is gained overall.

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I marked this as stale due to inactivity. → More info