chore: create shell.nix and update flake.* (#8129)

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8129
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: famfo <famfo@famfo.xyz>
Co-committed-by: famfo <famfo@famfo.xyz>

flake.lock

@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1733392399,
+        "lastModified": 1749285348,
-        "narHash": "sha256-kEsTJTUQfQFIJOcLYFt/RvNxIK653ZkTBIs4DG+cBns=",
+        "narHash": "sha256-frdhQvPbmDYaScPFiCnfdh3B/Vh81Uuoo0w5TkWmmjU=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "d0797a04b81caeae77bcff10a9dde78bc17f5661",
+        "rev": "3e3afe5174c561dee0df6f2c2b2236990146329f",
         "type": "github"
       },
       "original": {

flake.nix

@@ -3,35 +3,20 @@
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
   };
-  outputs = {
+  outputs =
-    nixpkgs,
+    {
-    flake-utils,
+      nixpkgs,
-    ...
+      flake-utils,
-  }:
+      ...
+    }:
     flake-utils.lib.eachDefaultSystem (
-      system: let
+      system:
+      let
         pkgs = nixpkgs.legacyPackages.${system};
-      in {
+      in
-        devShells.default = pkgs.mkShell {
+      {
-          buildInputs = with pkgs; [
+        devShells.default = import ./shell.nix { inherit pkgs; };
-            # generic
+        formatter = pkgs.nixfmt-rfc-style;
-            git
-            git-lfs
-            gnumake
-            gnused
-            gnutar
-            gzip
-
-            # frontend
-            nodejs_20
-
-            # backend
-            gofumpt
-            sqlite
-            go
-            gopls
-          ];
-        };
       }
     );
 }

shell.nix

@@ -0,0 +1,28 @@
+{
+  pkgs ? import <nixpkgs> { },
+}:
+
+pkgs.mkShell {
+  name = "forgejo";
+  nativeBuildInputs = with pkgs; [
+    # generic
+    git
+    git-lfs
+    gnumake
+    gnused
+    gnutar
+    gzip
+
+    # frontend
+    nodejs
+
+    # backend
+    gofumpt
+    sqlite
+    go
+    gopls
+
+    # tests
+    openssh
+  ];
+}