Bug 1903175 - Skip long pause at the end of mach try when using git. r=sheehan

Differential Revision: https://phabricator.services.mozilla.com/D214061

python/mozversioncontrol/mozversioncontrol/__init__.py

@@ -877,6 +877,11 @@ class GitRepository(Repository):
         try:
             cmd = (
                 str(self._tool),
+                "-c",
+                # Never store git-cinnabar metadata for pushes to try.
+                # Normally git-cinnabar asks the server what the phase of what it pushed
+                # is, and figures on its own, but that request takes a long time on try.
+                "cinnabar.data=never",
                 "push",
                 "hg::ssh://hg.mozilla.org/try",
                 "+HEAD:refs/heads/branches/default/tip",

python/mozversioncontrol/test/test_push_to_try.py

@@ -44,6 +44,8 @@ def test_push_to_try(repo, monkeypatch):
             ),
             (
                 str(tool),
+                "-c",
+                "cinnabar.data=never",
                 "push",
                 "hg::ssh://hg.mozilla.org/try",
                 "+HEAD:refs/heads/branches/default/tip",