[sysadmin-bin] git: Add get_project_branches()

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit fd2b7ae4cc02eb17764499edfd9b1dce87e3f77f
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Tue Oct 15 14:31:20 2019 +0200

    git: Add get_project_branches()

 git/git.py | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/git/git.py b/git/git.py
index 3bc1154..c3ca2a9 100644
--- a/git/git.py
+++ b/git/git.py
@@ -228,3 +228,8 @@ def get_project_head_name():
         die("There was an error fetching project HEAD: %s" % e)
 
     return branch_name
+
+def get_project_branches():
+    lines = git.branch(list=True, _split_lines=True)
+    branches = [line[2:] for line in lines]
+    return branches