[Python] manylinux container confusing #19662
Description
The layout of the Docker container for manylinux builds is a bit confusing and error-prone. The Arrow source code is present both in /arrow and /io/arrow, and it's easy to get the two diverging if you're not careful.
Reporter: Antoine Pitrou / @pitrou
Assignee: Uwe Korn / @xhochy
PRs and other links:
Note: This issue was originally created as ARROW-3327. Please see the migration documentation for further details.