Add devtoolset 8 (gcc 8) + glibc 2.26 + centos 7.5 rocm docker image (#19767)
Summary:
xw285cornell
Will add py3.6-devtoolset8-glibc2.26-rocmrpm-centos7.5
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19767
Differential Revision: D15094446
Pulled By: bddppq
fbshipit-source-id: 01a932d893cf4559f98612888308b3ad6900a038
