docker: fix bug in waiting for container to exit #24081
Merged
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In ##23966 when we switched to using the official Docker SDK client, we had more contexts to add because most of the library methods take one. But for some APIs like waiting for a container to exit after we've started it, we never want to close this context, because the container can outlive the Nomad agent itself. If we close this context, the waiter fails and then we stop the container (after only running 5min).