chore(dist): add Linux desktop integration files for installation

Desktop entry, AppStream metainfo, D-Bus service and systemd user unit
templates plus icons, adapted from ZIG/dist/linux and used by
`just install`.

dist/linux/ghostty_nautilus.py

@@ -0,0 +1,66 @@
+# Adapted from wezterm: https://github.com/wez/wezterm/blob/main/assets/wezterm-nautilus.py
+# original copyright notice:
+#
+# Copyright (C) 2022 Sebastian Wiesner <sebastian@swsnr.de>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+from pathlib import Path
+import gettext
+from gi.repository import Nautilus, GObject, Gio
+
+DOMAIN = "com.mitchellh.ghostty"
+locale_dir = Path(__file__).absolute().parents[2] / "locale"
+_ = gettext.translation(DOMAIN, locale_dir, fallback=True).gettext
+
+def open_in_ghostty_activated(_menu, paths):
+    for path in paths:
+        cmd = ['ghostty', f'--working-directory={path}', '--gtk-single-instance=false']
+        Gio.Subprocess.new(cmd, Gio.SubprocessFlags.NONE)
+
+
+def get_paths_to_open(files):
+    paths = []
+    for file in files:
+        location = file.get_location() if file.is_directory() else file.get_parent_location()
+        path = location.get_path()
+        if path and path not in paths:
+            paths.append(path)
+    if 10 < len(paths):
+        # Let's not open anything if the user selected a lot of directories,
+        # to avoid accidentally spamming their desktop with dozends of
+        # new windows or tabs.  Ten is a totally arbitrary limit :)
+        return []
+    else:
+        return paths
+
+
+def get_items_for_files(name, files):
+    paths = get_paths_to_open(files)
+    if paths:
+        item = Nautilus.MenuItem(name=name, label=_('Open in Ghostty'),
+            icon='com.mitchellh.ghostty')
+        item.connect('activate', open_in_ghostty_activated, paths)
+        return [item]
+    else:
+        return []
+
+
+class GhosttyMenuProvider(GObject.GObject, Nautilus.MenuProvider):
+    def get_file_items(self, files):
+        return get_items_for_files('GhosttyNautilus::open_in_ghostty', files)
+
+    def get_background_items(self, file):
+        return get_items_for_files('GhosttyNautilus::open_folder_in_ghostty', [file])