Module extension for pull #64
Description
It's likely that some common repo names will appear in multiple modules in the graph, for example the root module might have
pull(
name = "ubuntu",
digest = "sha256:c279a739b31ead4ebc3e9ce04937eb8b612799b52c26133eb3b4a056d08c31a6",
repository = "ubuntu",
tag = "24.04",
)
while a transitive module declares ubuntu with a different digest. Since this repo recommends use_repo_rule we end up with WORKSPACE semantics of first-declaration-wins.
It might be better to write a module extension to collect tags across the full module graph to have a better resolution strategy - likely users want the root module declaration to win, and perhaps get a warning that other declarations were not used.