Build project-download-commands plugin for Gerrit v3.[0-2]

Change-Id: I281a17925b7b886f1fba33ce614316da4c121304
diff --git a/jenkins/gerrit-bazel-plugin-project-download-commands.yaml b/jenkins/gerrit-bazel-plugin-project-download-commands.yaml
index 64b47da..ccc8c17 100644
--- a/jenkins/gerrit-bazel-plugin-project-download-commands.yaml
+++ b/jenkins/gerrit-bazel-plugin-project-download-commands.yaml
@@ -1,6 +1,11 @@
 - project:
     name: project-download-commands
     jobs:
-      - 'plugin-{name}-bazel-{branch}':
+      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
           branch:
             - master
+          gerrit-branch:
+            - master
+            - stable-3.2
+            - stable-3.1
+            - stable-3.0