chore: add gcc 10.5.0 glibc 2.28 toolchain (microsoft#46)

* feat: add support gcc 7.5.0-glibc 2.17 sysroot

* ci: add centos and bionic containers

* ci: use qemu for arm targets

* chore: add gcc 4.9.4 glibc 2.17 toolchain targets

* ci: remove unused containers

* Revert "chore: add gcc 4.9.4 glibc 2.17 toolchain targets"

This reverts commit b9882c8.

* chore: add gcc 10.5.0 glibc 2.28 toolchain

* chore: cleanup

* fix: platform option

* chore: build gcc 8.5.0 glibc 2.28

Author: deepak1556