ci: add rx-zephyr-elf to target platforms

Signed-off-by: Duy Nguyen <[email protected]>

Author: duynguyenxa

.github/workflows/ci.yml

@@ -50,6 +50,7 @@ on:
         - mips-zephyr-elf
         - nios2-zephyr-elf
         - riscv64-zephyr-elf
+        - rx-zephyr-elf
         - sparc-zephyr-elf
         - x86_64-zephyr-elf
         - xtensa-amd_acp_6_0_adsp_zephyr-elf