no need for a cron job
custom fake git history with this: https://github.com/artiebits/fake-git-history
If you want to play the game: https://github.com/artiebits/fake-git-history
To some degree that can be faked: https://github.com/artiebits/fake-git-history
Thankfully, someone has already create a tool [0] for just this scenario!
Obligatory: https://github.com/artiebits/fake-git-history (does just what it says on the tin)
"I don't encourage people to cheat. But if anybody is judging your professional skills by the graph at your GitHub profile, they deserve to see a rich graph"