Add build batching for official builds (dotnet/corefx#35122)

Commit migrated from https://github.com/dotnet/corefx/commit/55d782a76e3021b7979b91198d78145d6399be54

diff --git a/eng/pipelines/libraries/.azure-ci.yml b/eng/pipelines/libraries/.azure-ci.yml
index 6e9cd4cae1c1a307e15985270fcae598ec2cfcd7..195e86fd72106e020461b6c68d2c0ede15642496 100644 (file)
--- a/eng/pipelines/libraries/.azure-ci.yml
+++ b/eng/pipelines/libraries/.azure-ci.yml
@@ -1,6 +1,12 @@
-# Disable triggers for now. TODO: add right merge triggers.
+# Setting batch to true, triggers one build at a time.
+# if there is a push while a build in progress, it will wait,
+# until the running build finishes, and produce a build with all the changes
+# that happened during the last build.
 trigger:
-- master
+  batch: true
+  branches:
+    include:
+    - master
 
 # TODO: add paths to exclude CI when modifying docs or stuff not affecting the build
 pr: