ci(zephyr): build for qemu-riscv64

Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>

Author: casaroli

.github/workflows/zephyr.yml

@@ -27,6 +27,7 @@ jobs:
           - pico_plus2/rp2350b/m33
           - native_sim/native/64
           - b_u585i_iot02a
+          - qemu_riscv64
         app:
           - mini
           - demo