CI: install libxdo-dev for the Linux tray link

The x86_64 Linux tray failed at link with "unable to find library -lxdo":
tray-icon pulls libxdo, whose .so was not present. Add libxdo-dev to the GUI
build's apt install, alongside libgtk-3-dev and libayatana-appindicator3-dev.
Everything else (aarch64 agent, macOS, Windows) already built.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -117,7 +117,7 @@ jobs:
               # (x86_64 only) against the runner's glibc.
               sudo apt-get update
               sudo apt-get install -y --no-install-recommends \
-                libgtk-3-dev libayatana-appindicator3-dev
+                libgtk-3-dev libayatana-appindicator3-dev libxdo-dev
               cargo build --release --locked \
                 --target "${{ matrix.gnu_target }}" --bin tsunagi-tray
             else

.github/workflows/release.yml

@@ -119,7 +119,7 @@ jobs:
               # (x86_64 only) against the runner's glibc.
               sudo apt-get update
               sudo apt-get install -y --no-install-recommends \
-                libgtk-3-dev libayatana-appindicator3-dev
+                libgtk-3-dev libayatana-appindicator3-dev libxdo-dev
               cargo build --release --locked \
                 --target "${{ matrix.gnu_target }}" --bin tsunagi-tray
             else