Use ci_timeout for merging (#328)

When the bot is waiting for "merge when pipeline suceeds"
the hardcoded 5 minute timeout was applied.

We need to wait for CI to finish in this case,
so setting the merge timeout to CI timeout.

marge/job.py

@@ -22,7 +22,7 @@ def __init__(self, *, api, user, project, repo, options):
         self._project = project
         self._repo = repo
         self._options = options
-        self._merge_timeout = timedelta(minutes=5)
+        self._merge_timeout = options.ci_timeout
 
     @property
     def repo(self):