1.20.1

Add ourgit with two implementations

A go-git-based one, which doesn't require an external git binary but
doesn't support referenced repos, and a shell-based one.

PUBLISHED_FROM=46b8a0e5c5f81b8e0392cea31705d1c7765ee2b8

1.20

Add ourgit with two implementations

A go-git-based one, which doesn't require an external git binary but
doesn't support referenced repos, and a shell-based one.

PUBLISHED_FROM=46b8a0e5c5f81b8e0392cea31705d1c7765ee2b8