Home/Nixinator: Add steam-run and fix nix-alien flake input

flake.lock

@@ -627,7 +627,7 @@
     },
     "naersk": {
       "inputs": {
-        "nixpkgs": "nixpkgs_3"
+        "nixpkgs": "nixpkgs_4"
       },
       "locked": {
         "lastModified": 1733346208,
@@ -647,9 +647,7 @@
       "inputs": {
         "flake-compat": "flake-compat_2",
         "nix-index-database": "nix-index-database",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
+        "nixpkgs": "nixpkgs_2"
       },
       "locked": {
         "lastModified": 1752566074,
@@ -735,6 +733,22 @@
       }
     },
     "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1752950548,
+        "narHash": "sha256-NS6BLD0lxOrnCiEOcvQCDVPXafX1/ek1dfJHX1nUIzc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c87b95e25065c028d31a94f06a62927d18763fdf",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_3": {
       "locked": {
         "lastModified": 1752950548,
         "narHash": "sha256-NS6BLD0lxOrnCiEOcvQCDVPXafX1/ek1dfJHX1nUIzc=",
@@ -750,7 +764,7 @@
         "type": "github"
       }
     },
-    "nixpkgs_3": {
+    "nixpkgs_4": {
       "locked": {
         "lastModified": 1734323986,
         "narHash": "sha256-m/lh6hYMIWDYHCAsn81CDAiXoT3gmxXI9J987W5tZrE=",
@@ -904,7 +918,7 @@
         "impermanence": "impermanence",
         "nix-alien": "nix-alien",
         "nix-flatpak": "nix-flatpak",
-        "nixpkgs": "nixpkgs_2",
+        "nixpkgs": "nixpkgs_3",
         "nixpkgs-stable": "nixpkgs-stable",
         "nixvim": "nixvim",
         "nps": "nps",

flake.nix

@@ -41,7 +41,9 @@
 
     # Run unpatched binaries on NixOS
     nix-alien.url = "github:thiagokokada/nix-alien";
-    nix-alien.inputs.nixpkgs.follows = "nixpkgs";
+    # Don't follow nixpkgs:
+    # https://github.com/thiagokokada/nix-alien#user-content-nixos-installation-with-flakes
+    # nix-alien.inputs.nixpkgs.follows = "nixpkgs";
 
     # Hyprland (use flake so plugins are not built from source)
     hyprland.url = "github:hyprwm/Hyprland";

home/christoph/nixinator/default.nix

@@ -130,6 +130,7 @@
         rider-unity
         dotnetCore
         mono
+        steam-run-free # nix-alien doesn't seem to run unity apps, this does...
 
         blender
         godot_4