Revert "Remove gc-conductor from checkers"

This reverts commit 5d0961395ec6d3b1f94034545b8f937b12491a97.

Reason for revert: Was seeing if re-applying would fix it.

Change-Id: I9d5264a2c9c2de053c1b79757155dedc293dde47

checkers.yaml

diff --git a/checkers.yaml b/checkers.yaml
index 87280b4..780fd9b 100644
--- a/checkers.yaml
+++ b/checkers.yaml
@@ -146,6 +146,11 @@
     name: "Zuul Check Pipeline"
     description: "Run Zuul jobs on new patchsets"
 
+  - uuid: "zuul-check:plugins_gc-conductor"
+    repository: "plugins/gc-conductor"
+    name: "Zuul Check Pipeline"
+    description: "Run Zuul jobs on new patchsets"
+
   - uuid: "zuul-check:plugins_go-import"
     repository: "plugins/go-import"
     name: "Zuul Check Pipeline"