Add custom wallpaper.

builder/stage4/04-pisdr-system/01-run.sh

@@ -1,3 +1,9 @@
 install -m 755 shortcut/gnuradio.desktop "/home/${FIRST_USER_NAME}/Desktop"
 install -m 755 shortcut/gqrx.desktop "/home/${FIRST_USER_NAME}/Desktop"
-install -m 755 shortcut/sdrangel.desktop "/home/${FIRST_USER_NAME}/Desktop"
+install -m 755 shortcut/sdrangel.desktop "/home/${FIRST_USER_NAME}/Desktop"
+
+install -m 755 wallpaper/donald-giannatti-vla.jpg "${ROOTFS_DIR}/usr/share/rpd-wallpaper/"
+
+on_chroot << EOF
+pcmanfm --set-wallpaper ${ROOTFS_DIR}/usr/share/rpd-wallpaper/donald-giannatti-vla.jpg
+EOF