topgrade: gate neovim tarball updater to debian family only

update-neovim.sh and the topgrade [commands] entry that calls it are
only meaningful where neovim is not a distro package. On arch-family
boxes the template renders empty, so chezmoi removes the script
instead of deploying a no-op, and topgrade no longer runs a step that
could fail on unmanaged paths.

dot_local/bin/update-neovim.sh

@@ -1,68 +0,0 @@
-#!/usr/bin/env bash
-# =============================================================================
-#  update-neovim.sh — chezmoi-managed, deployed to ~/.local/bin/update-neovim.sh
-#
-#  Installs or upgrades neovim from the official binary tarball.
-#  Bump NVIM_TARGET_VERSION to upgrade. Topgrade calls this via
-#  ~/.config/topgrade/topgrade.toml.
-#
-#  Debian-only: arch gets neovim from pacman (see PACMAN_PKGS in
-#  run_once_20-install-user-packages.sh.tmpl), so this is a no-op
-#  on non-debian machines.
-#
-#  Idempotent: no-op if installed version matches target.
-# =============================================================================
-set -euo pipefail
-
-OS_ID="$(. /etc/os-release 2>/dev/null && echo "$ID" || true)"
-if [[ "$OS_ID" != "debian" ]]; then
-    echo "neovim: not debian ($OS_ID) — no action"
-    exit 0
-fi
-
-NVIM_TARGET_VERSION="v0.11.4"
-
-ARCH="$(uname -m)"
-case "$ARCH" in
-    x86_64)
-        NVIM_TARBALL="nvim-linux64.tar.gz"
-        NVIM_EXTRACT_DIR="nvim-linux64"
-        ;;
-    aarch64|arm64)
-        NVIM_TARBALL="nvim-linux-arm64.tar.gz"
-        NVIM_EXTRACT_DIR="nvim-linux-arm64"
-        ;;
-    *)
-        echo "unsupported arch: $ARCH" >&2
-        exit 1
-        ;;
-esac
-
-if command -v nvim >/dev/null 2>&1; then
-    INSTALLED_VER="$(nvim --version 2>/dev/null | head -1 | awk '{print $2}')"
-    if [[ "$INSTALLED_VER" == "$NVIM_TARGET_VERSION" ]]; then
-        echo "neovim $INSTALLED_VER matches target — no action"
-        exit 0
-    fi
-    echo "neovim $INSTALLED_VER -> $NVIM_TARGET_VERSION"
-else
-    echo "installing neovim $NVIM_TARGET_VERSION"
-fi
-
-cd /tmp
-TMP_TARBALL="$(mktemp /tmp/nvim-update.XXXXXX.tar.gz)"
-trap 'rm -f "$TMP_TARBALL"' EXIT
-
-if ! curl -fL --retry 3 \
-    "https://github.com/neovim/neovim/releases/download/${NVIM_TARGET_VERSION}/${NVIM_TARBALL}" \
-    -o "$TMP_TARBALL"; then
-    echo "failed to download $NVIM_TARBALL" >&2
-    exit 1
-fi
-
-sudo rm -rf /opt/nvim-linux* /usr/local/bin/nvim
-sudo tar -xzf "$TMP_TARBALL" -C /opt/
-sudo ln -sf "/opt/${NVIM_EXTRACT_DIR}/bin/nvim" /usr/local/bin/nvim
-
-echo "neovim $NVIM_TARGET_VERSION installed"
-nvim --version | head -1