[tlbuild] tl24 build plans

[Norbert Preining]

> Aarch64 and arm can also be built on GitHub using qemu.

I got aarch64 and arm7 builds running via github actions.
I will work on further builds.

Best regards

Norbert

PS: GH actions are a pain, see https://github.com/actions/setup-node/issues/922
for building different arch or musl ...

--
PREINING Norbert                              https://www.preining.info
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