disable git diff colors in git lb-push

with

[color]
  diff = always # keep colors alive when piping through grep/sed/head or into `less -R`

in the $(HOME)/.gitconfig, calling git lb-push fails as outlined here.

This can be repaired (other than, of cause, on the user side) by explicitly adding --no-color in the git diff call in git-lb-push. It appears color settings for git log and git status do not interfere with the git lb-* commands

LbRelease/scripts/git-lb-push

@@ -289,7 +289,7 @@ def main():
                 git(['checkout', '--quiet', commit, '--', pkg], cwd=tmprepo)
             pkgs_to_patch = list(commit_info['packages'] - commit_info['first'])
             if pkgs_to_patch:
-                patch = git_o(['log', '-p', '-n', '1', commit, '--'] +
+                patch = git_o(['log', '--no-color', '-p', '-n', '1', commit, '--'] +
                               pkgs_to_patch, cwd=tmprepo, no_strip=True)
                 if patch:
                     proc = Popen(['git', 'apply', '--index'], stdin=PIPE, cwd=tmprepo)