CT-1572 add comment with insights into why we rm in Dockerfile.base
CT-1572 add comment with insights into why we rm in Dockerfile.base

ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff