README: install by hand while the repo is private

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -53,7 +53,9 @@ IPTV Simple's settings (or delete the instance file).
 2. `python3 -I tools/check.py` tests every stream with ffprobe.
 3. `python3 -I tools/build.py` writes `resources/radio.m3u` and fetches missing logos.
 4. Raise `version` in `addon.xml` (and add a `<news>` line), commit, push to `main`.
-5. Publish: dispatch the skin repo's `kodi-repo.yml` workflow; boxes update
-   from repository.xocko.
+5. Install on a box: the repo is private and the add-on isn't in
+   repository.xocko yet, so copy it by hand (Kodi then runs the service again
+   after `Addons.SetAddonEnabled` false/true):
+   `git archive HEAD | ssh root@<box> 'tar -xf - -C /storage/.kodi/addons/service.radios.vigo'`
 
-`tools/` and this README aren't in the add-on zip (`.gitattributes` export-ignore).
+`tools/` and this README aren't in the add-on (`.gitattributes` export-ignore).