Without this, `nix build .#checks.x86_64-linux.wifi` fails with:
```
error: The option `nodes.first.systemd.services.NetworkManager-setup-secrets.serviceConfig.ExecStart' has conflicting definition values:
- In `/nix/store/x0…45-source/clanServices/wifi/default.nix, via option mappedServices."self-@clan/wifi".roles.default.perInstance, via option nixosModule': <derivation wifi-secrets>
- In `/nix/store/x0…45-source/clanServices/wifi/default.nix, via option mappedServices."self-@clan/wifi".roles.default.perInstance, via option nixosModule': <derivation wifi-secrets>
Use `lib.mkForce value` or `lib.mkDefault value` to change the priority on any of these definitions.
```
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