build.sh: fix cache save in manylinux runs#82
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Container runs as root and creates files owned by UID 0 in the bind-
mounted workspace. The host runner user can't read some of them
(e.g. curl-src/config.{guess,sub}), so actions/cache's tar fails with
'Cannot open: Permission denied' and the cache save is skipped. Every
CI run was cold cache as a result.
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manylinux Docker runs as root and creates files in the bind-mounted workspace owned by UID 0. The host runner user can't read all of them (e.g. `curl-src/config.guess`, `curl-src/config.sub`), so `actions/cache`'s post-job `tar` fails with `Cannot open: Permission denied` and the cache save is skipped. Every CI run has been cold cache as a result — verified on master CI logs.
Fix: chown the workspace back to the host UID at the end of the in-container build.