Can we re-use `core` file on all projects?

[bserem]

Recently we made a change to gitignore the core file that backstop adds inside test/backstop folder on every project.

While that saves us from committing the file, it is still being downloaded and uses space on every project.
Can we somehow have this somewhere globally and re-use it? Like the ddev docker image?

It might sound like an overkill, but our team maintains a good number of sites and this file is everywhere.