Add serviceuser plugin checker

Change-Id: I62c8b62d2a825318dac97d7e939d6b4a9aba6dc0
diff --git a/checkers.yaml b/checkers.yaml
index d93c68f..e44d620 100644
--- a/checkers.yaml
+++ b/checkers.yaml
@@ -195,3 +195,8 @@
     repository: "plugins/saml"
     name: "Zuul Check Pipeline"
     description: "Run Zuul jobs on new patchsets"
+
+  - uuid: "zuul-check:plugins_serviceuser"
+    repository: "plugins/serviceuser"
+    name: "Zuul Check Pipeline"
+    description: "Run Zuul jobs on new patchsets"
diff --git a/zuul/main.yaml b/zuul/main.yaml
index 7cd8849..55c1fd8 100644
--- a/zuul/main.yaml
+++ b/zuul/main.yaml
@@ -52,3 +52,4 @@
           - plugins/rename-project
           - plugins/reviewers
           - plugins/saml
+          - plugins/serviceuser