action: use $HOME/zephyr-sdk for the Zephyr SDK #47
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The Zephyr SDK install has a step where it tweaks the library paths of the host utilities so match the full install path and have them run without having to set LD_LIBRARY_PATH. In the current setup that path includes the repository name, which means that if the repository is renamed the cached SDK is going to end up having a non working path leading to a confusing error, typically dtc not found.
Move the SDK install to the home directory, so that the path does not depend on the repository name. The SDK is found using a CMake package so it can really be installed anywhere.