Include a package in the flake

flake.nix

@@ -11,27 +11,62 @@
         nixpkgs.follows = "nixpkgs";
       };
     };
+    naersk = {
+      url = "github:nmattia/naersk";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
-  outputs = { self, nixpkgs, flake-utils, rust-overlay }@inputs:
+  outputs = { self, nixpkgs, flake-utils, rust-overlay, naersk }@inputs:
     flake-utils.lib.simpleFlake {
       inherit self nixpkgs;
       name = "tlaternet";
       preOverlays = [ rust-overlay.overlay ];
 
-      shell = { pkgs }:
-        let
-          rust_channel =
-            pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
-        in pkgs.mkShell {
-          nativeBuildInputs = with pkgs; [
-            (rust_channel.override {
-              extensions =
-                [ "rust-src" "rust-analysis" "rust-analyzer-preview" ];
-            })
-            pkgconfig
-          ];
-          buildInputs = with pkgs; [ openssl ];
+      overlay = final: prev: {
+        tlaternet = let
+          # The rust toolchain to use
+          toolchain =
+            prev.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+
+          # The rust build lib, set to use the toolchain
+          naersk-lib = naersk.lib.${prev.system}.override {
+            cargo = toolchain;
+            rustc = toolchain;
+          };
+
+          # pkg-config, needed to include many native libs
+          nativeBuildInputs = [ prev.pkgconfig ];
+
+          # Native libs
+          buildInputs = [ prev.openssl ];
+
+        in rec {
+          # The packages provided by this flake
+          tlaternet = {
+            webserver = prev.callPackage
+              ({ rustPlatform, openssl, pkgconfig, ... }:
+                naersk-lib.buildPackage {
+                  inherit nativeBuildInputs buildInputs;
+
+                  pname = "tlaternet-webserver";
+                  root = ./.;
+                }) { };
+          };
+          defaultPackage = tlaternet.webserver;
+
+          # A dev shell to hack manually; note this includes
+          # additional toolchain components
+          devShell = prev.mkShell {
+            inherit buildInputs;
+            nativeBuildInputs = nativeBuildInputs ++ [
+              (toolchain.override {
+                extensions =
+                  [ "rust-src" "rust-analysis" "rust-analyzer-preview" ];
+              })
+            ];
+          };
         };
+      };
     };
 }