rcextensions: use extra_env to not override the default one inside vcsserver.

rhodecode/config/rcextensions/helpers/extract_pre_commits.py

@@ -54,7 +54,7 b' def get_git_commits(repo, refs):'
             '{}...{}'.format(old_rev, new_rev)
         ]
 
-        stdout, stderr = repo.run_git_command(cmd, env=git_env)
+        stdout, stderr = repo.run_git_command(cmd, extra_env=git_env)
         for line in stdout.splitlines():
             try:
                 data = json.loads(line)