Nice!
I’m new to RPi so may have missed something obvious. My install already had git. I verified this by doing your step 2 and it said it was already the current version.
I used the receipe below to make mine. I also did “apt-get update” and “apt-get upgrade” before the git command.
https://opensprinkler.com/forums/topic/ospi2-img-zip-in-the-ospi14-manual/#post-36146