Add playbook to update plotly.js

Author: Jody McIntyre

deployment/playbook_stage_update_plotlyjs.yml

@@ -0,0 +1,8 @@
+- hosts: localhost
+  gather_facts: False
+  vars:
+    cluster: imageserver-stage
+    zone: us-central1-a
+  roles:
+    - common
+    - update_plotlyjs

deployment/roles/update_plotlyjs/tasks/main.yml

@@ -0,0 +1,11 @@
+# From https://github.com/kubernetes/kubernetes/issues/27081#issuecomment-238078103
+# Change an unused variable in the deployment config, which will cause a
+# rolling update that creates new pods.  (New pods will automatically run the
+# latest plotly.js since that's loaded on boot.)
+
+- name: Show timestamp
+  local_action: command date +%s
+  register: date
+
+- name: Update plotly.js by patching the deployment
+  local_action: command kubectl patch deployment imageserver --patch "{\"spec\":{\"template\":{\"metadata\":{\"labels\":{\"RESTART_DATE\":\"{{ date.stdout }}\"}}}}}"