Add test target for release scheduler (flutter#115781)

* Add test scheduler

* Code review comments - added new line, update comment to include TODO

* Switch target to mimic Linux docs_deploy

Author: drewroengoogle

.ci.yaml

@@ -4609,3 +4609,28 @@ targets:
       tags: >
         ["devicelab", "hostonly", "mac"]
       task_name: flutter_tool_startup__macos
+
+  # TODO(drewroengoogle): Remove this target when the release scheduler is
+  # confirmed to be working correctly and as intended.
+  # (https://github.com/flutter/flutter/issues/100806)
+  # This target is marked `bringup: true` because this is a temporary target
+  # that is not intended to impact the tree.
+  - name: Linux docs_deploy_with_release_scheduler
+    recipe: flutter/flutter
+    scheduler: release
+    bringup: true
+    presubmit: false
+    timeout: 60
+    properties:
+      cores: "32"
+      dependencies: >-
+        [
+          {"dependency": "dashing", "version": "0.4.0"},
+          {"dependency": "firebase", "version": "v11.0.1"}
+        ]
+      tags: >
+        ["framework", "hostonly", "linux"]
+      validation: docs
+      validation_name: Docs
+      firebase_project: master-docs-flutter-dev
+      release_ref: refs/heads/master