As stated in the Prerequisites, currently only x86_64 is supported. However, it is possible to set the target architecture, and some tools can be built on the host or other measures can be used.
To that end add the following variable to your vars.yaml file:
matrix_architecture = <your-matrix-server-architecture>
Currently supported architectures are the following:
amd64 (the default)arm64arm32On most roles self-building is used if the architecture is not amd64. Special cases: