Run cargo subcommands on all local packages

A tiny cargo subcommand for executing other subcommands on all "local" packages (ie. packages in the same repository). This allows running cargo test on all crates in a repo with a single command.

Example

This will run tests of all local crates (but see the notes below): cargo local-pkgs test

Notes

• The main package must have a dependency on all other crates in the repo (local crates not in the dependency graph of the main crate are skipped)
• A Cargo.lock must exist (you can either check it in, or run cargo build or cargo update before using this subcommand)