A pointer to a version of nixpkgs so all my projects can reuse the same nixpkgs version. This may also contain overlays that are useful for all my projects.
Note: nix with flake support is required.
Define a flake's input like the following:
inputs = {
nixpkgs-pointer.url = "github:yipengsun/nixpkgs-pointer";
nixpkgs.follows = "nixpkgs-pointer/nixpkgs";
flake-utils.follows = "nixpkgs-pointer/flake-utils";
};