feat(remote-dev): add Nix Home-Manager flake for Ubuntu 22 VM dev env

New remote-dev/ subdir with a Home-Manager flake that provisions a
headless dev environment on a remote Ubuntu 22.04 VM accessed via SSH.
Shares nvim, zellij, zsh, direnv, and ghostty configs from the same
dotfiles repo via mkOutOfStoreSymlink (no rebuilds on config edits).

CLI tool set mirrors the dev-tool subset of meta/base.txt; sysadmin
tools (procs, gdu, duf), lazygit, and node/yarn (only needed for
markdown-preview on GUI hosts) are excluded.

bootstrap.sh is one-shot: installs Nix via Determinate Systems
installer, clones the repo to ~/.local/share/dotfiles, runs
home-manager switch, and chshes to the nix-store zsh.

dot_config/zsh/dot_zshrc loses its hardcoded Arch plugin/git-prompt
paths in favour of a fallback search: Arch path first, then
$HOME/.nix-profile/share/. Same file works on host and VM.

.chezmoiignore: exclude remote-dev/ from chezmoi deploy on the host.

1 files changed, 106 insertions, 0 deletions

diff --git a/remote-dev/home.nix b/remote-dev/home.nix
new file mode 100644
index 0000000..a2b9392
--- /dev/null
+++ b/remote-dev/home.nix
@@ -0,0 +1,106 @@
+{ config, pkgs, lib, dotfilesRoot, ... }:
+
+let
+  # The dotfiles checkout is cloned to ~/.local/share/dotfiles by bootstrap.sh.
+  # We do NOT use `dotfilesRoot` as a Nix store path because that would copy
+  # the entire repo into the store on every rebuild. Instead, we symlink
+  # config dirs at runtime via `config.lib.file.mkOutOfStoreSymlink`, which
+  # points at the live working tree so edits take effect without a rebuild.
+  dotfiles = "${config.home.homeDirectory}/.local/share/dotfiles";
+  link = path: config.lib.file.mkOutOfStoreSymlink "${dotfiles}/${path}";
+in
+{
+  home.username = builtins.getEnv "USER";
+  home.homeDirectory = builtins.getEnv "HOME";
+  home.stateVersion = "25.05";
+
+  # ── Packages ────────────────────────────────────────────────────────────────
+  # Mirrors the dev-tool subset of `meta/base.txt` on the Arch host. Tools that
+  # only make sense on a workstation (procs/gdu/duf for sysadmin, lazygit
+  # unused, node/yarn only needed for markdown-preview on GUI) are excluded.
+  home.packages = with pkgs; [
+    # Editor + multiplexer
+    neovim
+    zellij
+    tree-sitter
+
+    # Search / move
+    ripgrep
+    fd
+    fzf
+    sd
+    choose
+
+    # Viewers
+    bat
+    lsd
+    glow
+
+    # Git stack
+    git
+    gh
+    delta
+
+    # JSON / YAML
+    jq
+    yq-go
+
+    # System
+    htop
+    fastfetch
+
+    # Net
+    curl
+    curlie
+    wget
+    dog
+    rsync
+    openssh
+
+    # Docs
+    tldr
+    man-db
+    man-pages
+
+    # Secrets (user can bring their key separately)
+    gnupg
+    pass
+
+    # Zsh and plugins (sourced from $HOME/.nix-profile/share/... by the shared zshrc)
+    zsh
+    zsh-syntax-highlighting
+    zsh-autosuggestions
+    zsh-history-substring-search
+  ];
+
+  # ── direnv + nix-direnv ─────────────────────────────────────────────────────
+  programs.direnv = {
+    enable = true;
+    nix-direnv.enable = true;
+    enableZshIntegration = false; # zshrc already calls `eval "$(direnv hook zsh)"`
+  };
+
+  # ── Shared config symlinks ──────────────────────────────────────────────────
+  # Live symlinks back into the cloned working tree so `git pull` is enough
+  # to update configs — no `home-manager switch` required after every edit.
+  xdg.configFile = {
+    "nvim".source             = link "dot_config/nvim";
+    "zellij".source           = link "dot_config/zellij";
+    "zsh/.zshrc".source       = link "dot_config/zsh/dot_zshrc";
+    "zsh/.zprofile".source    = link "dot_config/zsh/dot_zprofile";
+    "ghostty".source          = link "dot_config/ghostty";   # for terminfo refs only
+    "direnv/direnvrc".source  = link "dot_config/direnv/direnvrc";
+  };
+
+  # ZDOTDIR redirect so login shells find ~/.config/zsh/.zprofile etc.
+  home.file.".zshenv".text = ''
+    export ZDOTDIR="$HOME/.config/zsh"
+    [[ -r "$ZDOTDIR/.zshenv" ]] && source "$ZDOTDIR/.zshenv"
+  '';
+
+  # ── XDG base dirs (Ubuntu doesn't set these in /etc/profile.d by default) ──
+  xdg.enable = true;
+
+  # ── Enable HM-managed activation messages ──────────────────────────────────
+  programs.home-manager.enable = true;
+}