Add flake.nix

Add a new flake.nix for this repo, having extracted it from
nixos-configs. Add packages.nix copied from nixos-configs, as I
accidentally removed it while filtering to create this repo.

home/default.nix

@@ -1,8 +1,8 @@
 { pkgs, lib, ... }:
 
-let mypkgs = pkgs.callPackage ../modules/pkgs.nix { };
+ let packages  = pkgs.callPackage ./packages.nix {};
 in {
-  home.packages = mypkgs.all;
+  home.packages = packages.all;
   home.sessionVariables = {
     "PATH" = "$HOME/.local/bin:$PATH";
     "EDITOR" = "vim";

home/packages.nix

@@ -0,0 +1,24 @@
+{ pkgs }:
+with pkgs; rec {
+  # The stuff you want installed everywhere. The necessities.
+  base = [
+    bat # cat replacement, aliased to cat in home-manager
+    file
+    git
+    htop
+    lsof
+    mosh
+    tmux
+    unzip
+    vim
+    wget
+  ];
+
+  # Networking shit
+  net = [ iperf3 nmap socat tcpdump ];
+
+  # development tools
+  dev = [ jq nixfmt gh glab hexyl ];
+
+  all = (base ++ net ++ dev);
+}