Nix Improvements — heartwood

nix: use rust-overlay for toolchain pinning

To ensure the Nix derivations are using the correct toolchain, defined in the rust-toolchain file, use the rust-overlay library.

Also remove the fenix input, since this was actually never used and was an artefact of some copy-paste shenanigans.

nix: add rad-web app

To allow for Nix users to install rad-web easily, add the package to the set of packages and apps.

         "type": "github"
       }
     },
     "fenix": {
       "inputs": {
         "nixpkgs": [
           "nixpkgs"
         ],
         "rust-analyzer-src": []
       },
       "locked": {
         "lastModified": 1701930186,
         "narHash": "sha256-t9uIiU1fE7VXi3t460iOuAUW8Ece9mowRKva1aw48zI=",
         "owner": "nix-community",
         "repo": "fenix",
         "rev": "aeb764a8e4c16da3f36b200a302552d8e457b9f4",
         "type": "github"
       },
       "original": {
         "owner": "nix-community",
         "repo": "fenix",
         "type": "github"
       }
     },
     "flake-utils": {
       "inputs": {
         "systems": "systems"

       "inputs": {
         "advisory-db": "advisory-db",
         "crane": "crane",
         "fenix": "fenix",
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
         "nixpkgs": "nixpkgs",
         "rust-overlay": "rust-overlay"
       }
     },
     "rust-overlay": {
       "inputs": {
         "flake-utils": [
           "flake-utils"
         ],
         "nixpkgs": [
           "nixpkgs"
         ]
       },
       "locked": {
         "lastModified": 1708308739,
         "narHash": "sha256-FtKWP6d51kz8282jfziNNcCBpAvEzv2TtKH6dYIXCuA=",
         "owner": "oxalica",
         "repo": "rust-overlay",
         "rev": "d45281ce1027a401255db01ea44972afbc569b7e",
         "type": "github"
       },
       "original": {
         "owner": "oxalica",
         "repo": "rust-overlay",
         "type": "github"
       }
     },
     "systems": {

       inputs.nixpkgs.follows = "nixpkgs";
     };
     fenix = {
       url = "github:nix-community/fenix";
       inputs.nixpkgs.follows = "nixpkgs";
       inputs.rust-analyzer-src.follows = "";
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
       inputs = {
         nixpkgs.follows = "nixpkgs";
         flake-utils.follows = "flake-utils";
       };
     };
     flake-utils.url = "github:numtide/flake-utils";

     self,
     nixpkgs,
     crane,
     fenix,
     flake-utils,
     advisory-db,
     rust-overlay,
     ...
   }:
     flake-utils.lib.eachDefaultSystem (system: let
       pname = "Heartwood";
       pkgs = nixpkgs.legacyPackages.${system};
       pkgs = import nixpkgs {
         inherit system;
         overlays = [(import rust-overlay)];
       };
       inherit (pkgs) lib;
       craneLib = crane.lib.${system};
       rustToolChain = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain;
       craneLib = (crane.mkLib pkgs).overrideToolchain rustToolChain;
       srcFilters = path: type:
       # Allow sql schemas

             cargoBuildCommand = "cargo build --release -p radicle-httpd";
             doCheck = false;
           });
         rad-web = craneLib.buildPackage (commonArgs
           // {
             inherit (craneLib.crateNameFromCargoToml {cargoToml = ./radicle-httpd/Cargo.toml;});
             inherit cargoArtifacts;
             cargoBuildCommand = "cargo build --release --bin rad-web --manifest-path ./radicle-httpd/Cargo.toml";
             doCheck = false;
           });
       };
       apps.default = flake-utils.lib.mkApp {

         drv = self.packages.${system}.radicle-httpd;
       };
       apps.rad-web = flake-utils.lib.mkApp {
         name = "rad-web";
         drv = self.packages.${system}.rad-web;
       };
       devShells.default = craneLib.devShell {
         # Extra inputs can be added here; cargo and rustc are provided by default.
         packages = [

   "tracing-subscriber/env-filter"
 ]
 [[bin]]
 name = "radicle-httpd"
 path = "src/main.rs"
 [[bin]]
 name = "rad-web"
 path = "src/bin/rad-web.rs"
 [dependencies]
 anyhow = { version = "1" }
 axum = { version = "0.7.2", default-features = false, features = ["json", "query", "tokio", "http1"] }