Draft: ci: Also build a musl artifact always, to see how it does
Description
This is a prototype to build MUSL based release artifacts. At this point it'll run this stage always, though later we likely want to see if we can create proper release tarballs or somesuch from tags.
For now, this fixes #305
Checklist
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You have read, and followed the guidance in, the CONTRIBUTING guide - Please note that ticking this box also asserts that you have read and understood the Developer Certificate of Origin and that you have taken care to ensure all the commits are signed off appropriately.
- One such assertion is that your changes are appropriately licensed. The README clearly states Subplot is MIT-0.
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The MR content has run through a pipeline, or at least has pipelines enabled.