Changed the command for list changed files

publish_images.py

@@ -13,7 +13,7 @@ def get_changed_dockerfiles(vs_master=False):
     if vs_master:
         diff_cmd = "git --no-pager diff --name-only origin/master"
     else:
-        diff_cmd = "git diff-tree --no-commit-id --name-only -r HEAD"
+        diff_cmd = "git diff --name-only HEAD HEAD~1"
     child = sp.Popen(diff_cmd, shell=True, stdout=sp.PIPE, stderr=sp.PIPE)
     out, _ = child.communicate()