pw_presubmit: Add ninja log to save

Change-Id: Id9e56ffca6765cc9390db69d49b39d4262ac0f78
Reviewed-on: https://pigweed-review.googlesource.com/c/infra/recipes/+/64020
Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com>
Reviewed-by: Ted Pudlik <tpudlik@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/recipes/pw_presubmit.py b/recipes/pw_presubmit.py
index 4a622f1..44d8ac2 100644
--- a/recipes/pw_presubmit.py
+++ b/recipes/pw_presubmit.py
@@ -165,6 +165,7 @@
                         'ninja.graph',
                         'ninja.log',
                         'step.log',
+                        '.ninja_log',
                     ]
                     api.path.mock_add_file(build_dir.join('ninja.log'))