bake: fix compose files validation #3329
Merged
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fixes #3328
This is a regression from #3292 where we ignore unrelated fields, but we should check that the filtered model is not empty, similar to the load behavior in compose-go: https://github.com/compose-spec/compose-go/blob/a42e7579d813e64c0c1f598a666358bc0c0a0eb4/loader/loader.go#L541-L543.
Otherwise, it erroneously validates it as a Compose file and does not try to load it as an HCL/JSON definition.