ci: sync from octopus@v0.18.0

README.md

@@ -51,9 +51,17 @@ Open a **new** terminal and run `octopus`.
 
 ## Desktop (beta)
 
-Prefer a GUI? The Octopus desktop app ships a Windows beta build alongside the CLI:
+Prefer a GUI? The Octopus desktop app ships Windows and Linux beta builds alongside the CLI:
 
 - **Windows:** download [`octopus-desktop-win-x64.exe`](https://eightarms.net/Octopus/octopus-release/releases/download/desktop-beta/octopus-desktop-win-x64.exe) from the [`desktop-beta` channel](https://eightarms.net/Octopus/octopus-release/releases/tag/desktop-beta) and run the installer. Installed builds auto-update themselves from the same channel.
+- **Linux (x86_64):** download [`octopus-desktop-linux-x86_64.AppImage`](https://eightarms.net/Octopus/octopus-release/releases/download/desktop-beta/octopus-desktop-linux-x86_64.AppImage) from the same [`desktop-beta` channel](https://eightarms.net/Octopus/octopus-release/releases/tag/desktop-beta), make it executable and run it:
+
+  ```bash
+  chmod +x octopus-desktop-linux-x86_64.AppImage
+  ./octopus-desktop-linux-x86_64.AppImage
+  ```
+
+  The AppImage auto-updates itself from the same channel (`latest-linux.yml`). Prefer a native package? [`octopus-desktop-linux-amd64.deb`](https://eightarms.net/Octopus/octopus-release/releases/download/desktop-beta/octopus-desktop-linux-amd64.deb) and [`octopus-desktop-linux-x86_64.rpm`](https://eightarms.net/Octopus/octopus-release/releases/download/desktop-beta/octopus-desktop-linux-x86_64.rpm) are published on the same channel for first installs only — they do not auto-update (reinstall or switch to the AppImage for updates), and being unsigned they will trip a first-install warning on apt/dnf.
 - This is a beta channel — expect rough edges. macOS builds are on the way but not published yet.
 
 ## Documentation