v0.0-799-gb5a598f: gha: Use github cache.

Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>

v0.0-799-g27623b5: gha: Use github cache.

Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>

v0.0-798-g8aaeca1: gha: Export and then use tag value.

Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>

gha-fixes

Migrate more CST tests to use canonical form, which verifies substrin…

v0.0-201-g143e70b: Build release inside docker containers.

Supports;
 - Centos 6, 7 and 8
 - Ubuntu LTS version (Trusty 14.04, Xenial 16.04, Bionic 18.04)
 - Ubuntu latest version (Eoan 19.10)

Signed-off-by: Tim 'mithro' Ansell <me@mith.ro>