ci(release): use cargo tauri CLI for Linux bundler (#4225)

The release workflow installs the Rust-based tauri-cli from the
feat/truly-portable-appimage branch for Linux builds, but the
tauri-action step had no tauriScript input. Without it, tauri-action
falls back to the npm @tauri-apps/cli, so the custom truly-portable
AppImage bundler was never actually used.

Set tauriScript to `cargo tauri` for the Linux matrix entries so the
just-installed Rust CLI is used. macOS/Windows resolve to an empty
string and keep using the npm CLI as before.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.github/workflows/release.yml

@@ -313,6 +313,10 @@ jobs:
           NODE_OPTIONS: '--max-old-space-size=8192'
         with:
           projectPath: apps/readest-app
+          # On Linux, build with the Rust `cargo tauri` CLI installed in the
+          # step above so the new (truly-portable AppImage) bundler is used.
+          # Without this, tauri-action falls back to the npm @tauri-apps/cli.
+          tauriScript: ${{ matrix.config.release == 'linux' && 'cargo tauri' || '' }}
           releaseId: ${{ needs.get-release.outputs.release_id }}
           releaseBody: ${{ needs.get-release.outputs.release_note }}
           args: ${{ matrix.config.args || '' }}