fix(ci): drop sudo in e2e-install machine-id step

The e2e-install job runs inside the flatpak-github-actions container
which does not have sudo installed. The container already runs as root,
so sudo is unnecessary — use dbus-uuidgen and tee directly.

Assisted-by: Claude Sonnet 4.6 via OpenCode

Author: castrojo

.github/workflows/build.yml

@@ -1057,7 +1057,7 @@ jobs:
       - name: Ensure machine-id exists
         if: steps.arch-check.outputs.skip != 'true'
         run: |
-          sudo dbus-uuidgen | sudo tee /var/lib/dbus/machine-id
+          dbus-uuidgen | tee /var/lib/dbus/machine-id
 
       - name: Install ${{ matrix.app }}
         if: steps.arch-check.outputs.skip != 'true'