ci: add an Alpine (musl libc) job #33437

1. 
   fanquake commented at 2:06 pm on September 19, 2025: member

   This exists in some nightly repos alreaady, however we could have some libc diversity in the main CI, especially given static (musl based) binary discussion.
2. fanquake added the label Tests on Sep 19, 2025

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Tests