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This should have the same effect `system.extraDependencies` has in nixpkgs: adds paths to the runtime closure without installing them anywhere. This is useful for preventing garbage collection of packages that are expensive to rebuild. For example: - nixpkgs itself suggests using this for `factorio.src`, which requires a token to fetch. - we can use it to address #6157: avoid needlessly rebuilding completions for packages that do not have any. The implementation mirrors nixpkgs: add a file containing the store paths we want to keep around to the home-manager-generation derivation.