build: fix multiple named contexts pointing to same bake target #2444
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Contexts using target: schema are replaced by input: pointing to previous build result before build request is sent. Currently this replacement did not work if multiple contexts pointed to the same target name.
This happened because there is a map pointing back from result to the calling context. Previously one of the contexts (with random order) would be correctly replaced and another would be sent to buildkit as
target:
(where it would error is something wants to use it because it can't be resolved).Example case: