CI: uefi-only: Include u-boot in boot.bin

Fixes: 54d2c7f ("CI: add target to build UEFI-only boot.bin")
Signed-off-by: Janne Grunau <[email protected]>

Author: jannau

.github/workflows/installer.yml

@@ -84,6 +84,7 @@ jobs:
           cat build/m1n1.bin \
               u-boot/arch/arm/dts/t60*.dtb \
               u-boot/arch/arm/dts/t81*.dtb \
+              u-boot/u-boot-nodtb.bin.gz \
               > uefi-only/out/esp/m1n1/boot.bin
 
       - uses: actions/upload-artifact@v4