chore: split nixos and opentofu

nixos/flake.nix

@@ -0,0 +1,76 @@
+{
+  description = "Homelab configuration using flakes (v2 GitOps)";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+
+    flake-utils.url = "github:numtide/flake-utils";
+    
+    sops-nix = {
+      url = "github:Mic92/sops-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    
+    utils = {
+      url = "github:gytis-ivaskevicius/flake-utils-plus";
+      inputs.flake-utils.follows = "flake-utils";
+    };
+
+    pre-commit-hooks = {
+      url = "github:cachix/pre-commit-hooks.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = inputs@{
+    self, nixpkgs,
+    flake-utils, sops-nix, utils, pre-commit-hooks,
+    ...
+  }:
+  let
+    system = utils.lib.system.x86_64-linux;
+  in
+  utils.lib.mkFlake {
+    inherit self inputs;
+
+    outputsBuilder = channels: let
+      pkgs = channels.nixpkgs;
+      system = pkgs.system;
+      pre-commit-check = pre-commit-hooks.lib.${system}.run {
+        src = ./.;
+        hooks = {
+          nixfmt-rfc-style.enable = true;
+          statix.enable = true;
+          terraform-format.enable = true;
+        };
+      };
+    in {
+      checks = {
+        inherit pre-commit-check;
+      };
+      devShells.default = pkgs.mkShell {
+        inherit (pre-commit-check) shellHook;
+        buildInputs = pre-commit-check.enabledPackages;
+      };
+    };
+
+    hostDefaults = {
+      inherit system;
+
+      modules = [
+        ./modules
+        ./users
+
+        sops-nix.nixosModules.sops
+        ({ config, pkgs, ... }: {
+          # Inject git revision for our custom GitOps module to query
+          system.configurationRevision = self.rev or self.dirtyRev or "unknown";
+        })
+      ];
+    };
+
+    hosts = {
+      # Hosts will be populated here as they are migrated to the v2 branch.
+    };
+  };
+}