Dashboard release: install xdg-utils on Linux runners

The AppImage bundler copies xdg-open in for the opener plugin, and the ARM64
runner image doesn't ship it, so the Linux ARM64 leg failed to bundle.

Co-authored-by: Alfonso <alfonso-magic-context@users.noreply.github.com>

Author: ualtinok

.github/workflows/dashboard-release.yml

@@ -117,7 +117,9 @@ jobs:
         if: contains(matrix.settings.host, 'ubuntu')
         run: |
           sudo apt-get update
-          sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev patchelf
+          # xdg-utils: the AppImage bundler copies xdg-open in for the opener plugin
+          # (help links open in the browser). The x64 image ships it; ARM64 does not.
+          sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev patchelf xdg-utils
 
       - name: Install dependencies
         run: bun install