fix(ci): mkdir -p /run/dbus before starting dbus-daemon in e2e-install

The dbus-daemon --system --fork was failing with 'Failed to bind socket
/app/var/run/dbus/system_bus_socket: No such file or directory' because
the socket dir doesn't exist in the gnome-49 container. Create /run/dbus
before starting the daemon.

Assisted-by: Claude Sonnet 4.6 via OpenCode

Author: castrojo

.github/workflows/build.yml

@@ -1064,6 +1064,7 @@ jobs:
         if: steps.arch-check.outputs.skip != 'true'
         run: |
           mkdir -p /var/lib/dbus && dbus-uuidgen | tee /var/lib/dbus/machine-id
+          mkdir -p /run/dbus
           dbus-daemon --system --fork
 
       - name: Install ${{ matrix.app }}