Where is the web of trust that lets me cryptographically verify that my install.sh file was published by some PhD student in the Netherlands? And unless I trust

Where is the web of trust that lets me cryptographically verify that my install.sh file was published by some PhD student in the Netherlands? And unless I trust the https server, how do I know which PhD student in the Netherlands I'm supposed to trust? If this were software that I had to install multiple times (say there are several updates a year), it might make sense to implement TOFU with a published GPG key -- each successive update would use the same key I imported the first time. However, the nix installer installs a package manager which is self updating, and therefore implements TOFU itself.