Fixup cloudbuild command

Signed-off-by: Harry Callahan <hcallahan@lowrisc.org>

util/site/site-builder/cloudbuild-deploy-docs.yaml

diff --git a/util/site/site-builder/cloudbuild-deploy-docs.yaml b/util/site/site-builder/cloudbuild-deploy-docs.yaml
index 8b6a909..8c37397 100644
--- a/util/site/site-builder/cloudbuild-deploy-docs.yaml
+++ b/util/site/site-builder/cloudbuild-deploy-docs.yaml
@@ -4,6 +4,6 @@
 
 steps:
 - name: 'gcr.io/gold-hybrid-255313/builder'
-  args: ['util/site/build-docs.sh build']
+  args: ['util/site/build-docs.sh', 'build']
 - name: 'gcr.io/cloud-builders/gsutil'
   args: ['-m', 'rsync', '-r', '-d', 'build-site/', 'gs://gold-hybrid-255313-prod']