docs: use == operator in node.labels constraint #23522
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Description
https://docs.docker.com/reference/compose-file/deploy/#placement
In this section,
node.labels
must be specified. Also, it must be==
and not a simple=
, an error occurs without it:failed to update service myapp_redis: Error response from daemon: rpc error: code = Unknown desc = constraint expected one operator from ==, !=