Add Git to apt-list to support Git Sync plugin

[bp4151]

I would like to install the git sync plugin, but unless I am missing something, git needs to be included in the container OS in order to make that work.

I could easily grab the dockerfile and create my own local image, but I don't want to get out of sync with your releases.

I think this is as simple as adding git to the apt-get install list in the Dockerfile.

[bp4151]

I didn't catch Git in the docs, but it's there already. Closing this out. Nothing to see here...