Avoid looking for plugin's artifacts in subdirectories

The checks plugin stores its tests into an artifact called
checks.jar under the javatests directory tree. Do not recurse
subdirectories when looking for the plugin artifact, so
that test artifacts are not discovered.

Bug: Issue 14424
Change-Id: If352415b6c17f6e17552eb6376a6d9a5b6c943c7
diff --git a/jenkins/gerrit-bazel-build-plugin-branch.sh b/jenkins/gerrit-bazel-build-plugin-branch.sh
index 042ead1..e2cd0fb 100644
--- a/jenkins/gerrit-bazel-build-plugin-branch.sh
+++ b/jenkins/gerrit-bazel-build-plugin-branch.sh
@@ -37,7 +37,7 @@
                    --test_env DOCKER_HOST=$DOCKER_HOST"
 bazelisk test $BAZEL_OPTS //tools/bzl:always_pass_test plugins/{name}/...
 
-for JAR in $(find bazel-bin/plugins/{name} -name {name}*.jar)
+for JAR in $(find bazel-bin/plugins/{name} -maxdepth 1 -name {name}*.jar)
 do
     PLUGIN_VERSION=$(git describe  --always origin/{branch})
     echo -e "Implementation-Version: $PLUGIN_VERSION" > MANIFEST.MF