Improve the documentation on arch_rebuild.txt

[leofang]

Where should the content be added?

No response

What should be added?

See conda-forge/conda-forge-pinning-feedstock#2679 (comment). We need to add perhaps to the knowledge base that any feedstocks that could benefit from a rebuild targeting different architectures/platforms should add themselves to this arch_rebuild.txt list. The current mention is too short & terse.

Additional information

No response

[prachinandi]

@leofang I would like to take this issue can I?

[hmaarrfk]

Sure! Do you know where to start looking for the source document files?

[prachinandi]

Sure! Do you know where to start looking for the source document files?

Yes yes !! I know that.
Thanks! @hmaarrfk I am taking this issue

[ssurbhi560]

@jakirkham @leofang, I am working on this, but its still not very clear to me that how does adding a feedstock to arch_rebuild.txt takes care of migrating the feedstocks. Can you please explain this in a little more detail?

[leofang]

IIRC, the migration bot will send a migration PR to the feedstocks (and their dependencies) listed in arch_rebuild.txt and enable the aarch64/ppc64le builds. It's very similar to the idea of osx_arm64.txt for the Apple Silicon migration, which is well documented here:
https://conda-forge.org/docs/maintainer/knowledge_base.html#apple-silicon-builds