refactored dev flake to rust overlay, added deno to flake

flake.nix

@@ -1,49 +1,71 @@
 # This flake was initially generated by fh, the CLI for FlakeHub (version 0.1.10)
 {
-  description = "My personal website version 2.0";
+  # A helpful description of your flake
+  description = "A Gitea command line application";
 
+  # Flake inputs
   inputs = {
+    flake-schemas.url = "https://flakehub.com/f/DeterminateSystems/flake-schemas/*.tar.gz";
+
     nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/*.tar.gz";
-    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
-    flake-utils.url = "github:numtide/flake-utils";
+
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
+  # Flake outputs that other flakes can use
   outputs =
     { self
+    , flake-schemas
     , nixpkgs
-    , nixpkgs-unstable
-    , flake-utils
+    , rust-overlay
     ,
     }:
-    flake-utils.lib.eachDefaultSystem (
-      system:
-      let
-        pkgs = import nixpkgs {
-          inherit system;
-          overlays = [
-            (final: prev: {
-              deno = nixpkgs-unstable.legacyPackages.${system}.deno;
-            })
-          ];
-        };
-      in
-      {
-        devShells.default = pkgs.mkShell {
-          buildInputs = with pkgs; [
-            deno
-            rustc
-            cargo
-            cargo-edit
-            cargo-watch
-            cargo-vet
-            sqlx-cli
+    let
+      # Nixpkgs overlays
+      overlays = [
+        rust-overlay.overlays.default
+        (final: prev: {
+          rustToolchain = final.rust-bin.stable.latest.default.override { extensions = [ "rust-src" ]; };
+        })
+      ];
+
+      # Helpers for producing system-specific outputs
+      supportedSystems = [ "x86_64-linux" "aarch64-darwin" "x86_64-darwin" "aarch64-linux" ];
+      forEachSupportedSystem = f:
+        nixpkgs.lib.genAttrs supportedSystems (system:
+          f {
+            pkgs = import nixpkgs { inherit overlays system; };
+          });
+    in
+    {
+      # Schemas tell Nix about the structure of your flake's outputs
+      schemas = flake-schemas.schemas;
+
+      # Development environments
+      devShells = forEachSupportedSystem ({ pkgs }: {
+        default = pkgs.mkShell {
+          # Pinned packages available in the environment
+          packages = with pkgs; [
+            rustToolchain
+            rust-analyzer
             curl
             git
             jq
             wget
             nixpkgs-fmt
+            openssl
+            deno
           ];
+
+          # Environment variables
+          env = {
+            RUST_BACKTRACE = "1";
+            RUST_SRC_PATH = "${pkgs.rustToolchain}/lib/rustlib/src/rust/library";
+          };
         };
-      }
-    );
+      });
+    };
 }