chore(cloudbees-amd64-jenkins-jobs): add `libgit2` package

In order to make use of Git programmatically from Python, independent of
the `git` program (e.g. via the pygit2 Python package), we need to
install the official Git C library.

Change-Id: I1d755c5a5e0b3df2daa0cdbda4e8591bdcc84ec4
Signed-off-by: Chris Kay <chris.kay@arm.com>
1 file changed