Setup steps seem to be incomplete

[aeremin]

I am getting the following error while running west build:

-- ZEPHYR_TOOLCHAIN_VARIANT not set, trying to locate Zephyr SDK
CMake Error at /usr/local/google/home/aeremin/zds2023/zephyr/cmake/modules/FindZephyr-sdk.cmake:108 (find_package):
  Could not find a package configuration file provided by "Zephyr-sdk"
  (requested version 0.15) with any of the following names:

    Zephyr-sdkConfig.cmake
    zephyr-sdk-config.cmake

  Add the installation prefix of "Zephyr-sdk" to CMAKE_PREFIX_PATH or set
  "Zephyr-sdk_DIR" to a directory containing one of the above files.  If
  "Zephyr-sdk" provides a separate development package or SDK, be sure it has
  been installed.
Call Stack (most recent call first):
  /usr/local/google/home/aeremin/zds2023/zephyr/cmake/modules/FindHostTools.cmake:53 (find_package)
  /usr/local/google/home/aeremin/zds2023/zephyr/cmake/modules/dts.cmake:8 (find_package)
  /usr/local/google/home/aeremin/zds2023/zephyr/cmake/modules/zephyr_default.cmake:114 (include)
  /usr/local/google/home/aeremin/zds2023/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:66 (include)
  /usr/local/google/home/aeremin/zds2023/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:92 (include_boilerplate)
  CMakeLists.txt:6 (find_package)

Given that Zephyr SDK actually means "Zephyr-provided toolchain" (and we don't install it) - no surprise. Should we use Pigweed-provided toolchain? What values of ZEPHYR_TOOLCHAIN_VARIANT and GNUARMEMB_TOOLCHAIN_PATH you have? They are empty for me, setting them to gnuarmemb and /usr/local/google/home/aeremin/zds2023/pigweed/environment/cipd/packages/arm correspondingly results in successful build.