zuul: Fix test dependency on release.war

This is a fix for change I1712801 that added a test dependency on the
release.war. Zuul doesn't sync all the core submodules by default, so we
need to list them as required dependencies in order to build the release
war.

Release-Notes: skip
Change-Id: I71bfad7a59d95f5677111b635d3c5d3fc3cb14e2

.zuul.yaml

diff --git a/.zuul.yaml b/.zuul.yaml
new file mode 100644
index 0000000..4ddaa63
--- /dev/null
+++ b/.zuul.yaml
@@ -0,0 +1,22 @@
+- job:
+    name: plugins-plugin-manager-build
+    parent: gerrit-plugin-build
+    required-projects:
+      - polymer-bridges
+      - plugins/codemirror-editor
+      - plugins/commit-message-length-validator
+      - plugins/delete-project
+      - plugins/download-commands
+      - plugins/gitiles
+      - plugins/hooks
+      - plugins/replication
+      - plugins/reviewnotes
+      - plugins/singleusergroup
+      - plugins/webhooks
+
+- project:
+    description: |
+      Build the plugin in check.
+    check:
+      jobs:
+        - plugins-plugin-manager-build