Always pull the docker image.

Change-Id: I03c9aeb2642add4f932d4a9b249b39004379bbaf
diff --git a/cicd/pipelines/tasks/task_publish_unstable.jenkins b/cicd/pipelines/tasks/task_publish_unstable.jenkins
index 96cd7c3..f6b642b 100644
--- a/cicd/pipelines/tasks/task_publish_unstable.jenkins
+++ b/cicd/pipelines/tasks/task_publish_unstable.jenkins
@@ -22,7 +22,8 @@
                                         command: 'cat',
                                         args: '',
                                         ttyEnabled: true,
-                                        privileged: true)
+                                        privileged: true,
+                                        alwaysPullImage: true)
 def aptlyVolume = persistentVolumeClaim(claimName: 'aptly-state', mountPath: '/var/lib/aptly')
 
 podTemplate(label: buildLabel, containers: [jnlpContainer, debianContainer], volumes: [aptlyVolume], envVars: []) {