Fix CentOS

richardmaw-codethinkrequested to merge
richardmaw/centos-oldgit-test-fixes into master

Description

CentOS' old git doesn't support git describe --first-parent, git fetch --tags --force, and git rm doesn't change the contents of .gitmodules.

Fixing these issues makes the tests pass.

Changes proposed in this merge request:

  • Fetch git sources via refspecs instead of --tags and --force
  • Skip the git describe test since it produces different output with old git.
  • Skip a workspace test because git rm doesn't remove submodule config in old git.
  • Add CentOS runner configuration from !1053 (closed)

This merge request, when approved, will close #833 (closed) and obsolete !1053 (closed)

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