Can we make some experiments on the Linux time namespace for build
sandbox?

This can mock the real system with our desired value, maybe a good
solution for the reproduciblity on Linux machine.

Ref: https://man7.org/linux/man-pages/man7/time_namespaces.7.html
-- 
Retrieve my PGP public key:

  gpg --recv-keys D47A9C8B2AE3905B563D9135BE42B352A9F6821F

Zihao