Merging properties into ci yaml target.

Changes required to run the release_build sub-tasks correctly.
We need to merge drone properties with those defined in
ci.yaml.

Bug:b/232552448


Change-Id: I68265871febde3e34f58364fbddd38670a0111da
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/35360
Reviewed-by: Godofredo Contreras <godofredoc@google.com>
Commit-Queue: Yusuf Mohsinally <mohsinally@google.com>
diff --git a/recipe_modules/shard_util_v2/api.py b/recipe_modules/shard_util_v2/api.py
index 40644ff..4dc7f9a 100644
--- a/recipe_modules/shard_util_v2/api.py
+++ b/recipe_modules/shard_util_v2/api.py
@@ -152,6 +152,7 @@
     for build in builds:
       task_name = build.get('name')
       drone_properties = self.m.properties.thaw()
+      drone_properties.update(build.get('properties', []))
       drone_properties['build'] = build
       drone_properties['task_name'] = task_name
       # Delete builds property if it exists.