Creately - Git Flow - The template explains how the branches are organized within the GIT and how merging workflow works. You can use this to illustrate how the code release work.
A successful Git branching model » nvie.com
A better Gitflow diagram with branches, merges and color | TechTarget
Blog - How to create a gitflow diagram
How to use git flow · Camping Coder
vector drawings - How to draw diagrams for git workflow? - Ask Ubuntu