Bug 1574050 [wpt PR 18442] - [Azure Pipelines] Migrate scheduled buil…

…ds to YAML, a=testonly

Automatic update from web-platform-tests
[Azure Pipelines] Migrate scheduled builds to YAML (#18442)

Based on another migration which worked:
foolip/safari-technology-preview-updater@259eff3

Fixes web-platform-tests/wpt#17342.
--

wpt-commits: b16bc5597bb9981c3bd29ca3209979df0c9c24fe
wpt-pr: 18442

UltraBlame original commit: d3ff9a191f89e8fcdc40fbd7b574be12eb06228a

testing/web-platform/tests/.azure-pipelines.yml

@@ -67,6 +67,30 @@ devops
 /
 pipelines
 /
+build
+/
+triggers
+#
+https
+:
+/
+/
+docs
+.
+microsoft
+.
+com
+/
+en
+-
+us
+/
+azure
+/
+devops
+/
+pipelines
+/
 process
 /
 multiple
@@ -215,25 +239,6 @@ from
 forks
 #
 -
-A
-scheduled
-build
-needs
-to
-be
-set
-up
-for
-one
-of
-the
-epochs
-/
-*
-branches
-.
-#
--
 Self
 -
 hosted
@@ -304,6 +309,36 @@ agents
 v2
 -
 windows
+schedules
+:
+-
+cron
+:
+"
+15
+*
+/
+6
+*
+*
+*
+"
+displayName
+:
+Every
+six
+hours
+branches
+:
+include
+:
+-
+epochs
+/
+six_hourly
+always
+:
+true
 jobs
 :
 #