Longest passing streak

A monitoring dashboard stores a service's health-check history as a list of 0s and 1s, one entry per minute: 1 means the check passed, 0 means it failed. The reliability badge shows the longest unbroken run of passing checks in the window. Given the history list, return the length of that longest run of consecutive 1s. Return 0 for an empty list or a window with no passing checks. For example, [1, 1, 0, 1, 1, 1] returns 3.