add video_worker.yml and update update script

playbooks/edx-east/video_worker.yml

+- name: Deploy edX Video Worker Service
+  hosts: all
+  become: True
+  gather_facts: True
+  roles:
+    - aws
+    - role: video_worker

playbooks/roles/edx_ansible/templates/update.j2

@@ -14,7 +14,7 @@ IFS=","
 
     <repo> - must be one of edx-platform, edx-workers, xqueue, cs_comments_service, credentials, xserver, configuration,
     read-only-certificate-code, edx-analytics-data-api, edx-ora2, insights, ecommerce, course_discovery,
-    notifier, video_pipeline
+    notifier, video_pipeline, video_worker
     <version> - can be a commit or tag
 
 EO
@@ -62,6 +62,7 @@ repos_to_cmd["ecommerce"]="$edx_ansible_cmd ecommerce.yml -e 'ECOMMERCE_VERSION=
 repos_to_cmd["discovery"]="$edx_ansible_cmd discovery.yml -e 'DISCOVERY_VERSION=$2'"
 repos_to_cmd["notifier"]="$edx_ansible_cmd notifier.yml -e 'NOTIFIER_VERSION=$2'"
 repos_to_cmd["video_pipeline"]="$edx_ansible_cmd video_pipeline.yml -e 'VIDEO_PIPELINE_VERSION=$2'"
+repos_to_cmd["video_worker"]="$edx_ansible_cmd video_worker.yml -e 'VIDEO_WORKER_VERSION=$2'"
 
 
 if [[ -z $1 || -z $2 ]]; then