put g and git-flow into $PATH and chmod +x them.
g is git using docker.
$ g add -p
git flow executes git-flow.
$ git flow
usage: git flow <subcommand>
Available subcommands are:
init Initialize a new git repo with support for the branching model.
feature Manage your feature branches.
release Manage your release branches.
hotfix Manage your hotfix branches.
support Manage your support branches.
version Shows version information.
Try 'git flow <subcommand> help' for details.
q