Add note about cmake 3.19 not working with zephr ; addresses issue
@@ -71,6 +71,8 @@ sudo apt install -y \
:::note
Recent LTS releases of Debian and Ubuntu may include outdated CMake versions. If the output of `cmake --version` is older than 3.15, upgrade your distribution (e.g., from Ubuntu 18.04 LTS to Ubuntu 20.04 LTS), or else install CMake version 3.15 or newer manually (e.g, from Debian backports or by building from source).
+
+There is also a [zephyr bug](https://github.com/zephyrproject-rtos/zephyr/issues/22060) with cmake 3.19.x. You'll need a version _below_ 3.19.
:::
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