It would be nice to have ARM package built as part of the release process, but it's not on anyone's immediate roadmap AFAIK.
I don't see any open issue in elastic/beats regarding enhancing it to build ARM packages as part of the release. Can you please open a request. The build system is all open-source so if you wanted to help add ARM support it's all in the repo. The Beats are cross-compiled inside of a Docker container then the packages are built.
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