[Bug]: building with nix broke #65
Description
Bug summary
nix build
--extra-substituters "https://nix-wpe-webkit.cachix.org"
--extra-trusted-public-keys "nix-wpe-webkit.cachix.org-1:ItCjHkz1Y5QcwqI9cTGNWHzcox4EqcXqKvOygxpwYHE="
results in "error: flake 'git+file:///home/arthur/src/neomacs' does not provide attribute 'packages.x86_64-linux.default' or 'defaultPackage.x86_64-linux'"
Steps to reproduce
No response
Expected behavior
No response
Runtime diagnostics
Extra context
No response