nixos/openldap: add option for configuring OpenLDAP package to use #91963
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Motivation for this change
In certain cases, for example when custom OpenLDAP modules are
compiled into the binary, users may want to override the package used
for OpenLDAP.
This is especially common in setups where LDAP is the primary
authentication source, as good password hashing mechanisms need to be
enabled as extra modules.
Concretely this came up because we have enabled the Argos2 module in a deployment and the only way to update the OpenLDAP package was via an override in the package set, which causes extremely widespread rebuilds (as packages such as Python or GPG depend on OpenLDAP).
Things done
sandbox
innix.conf
on non-NixOS linux)nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
./result/bin/
)nix path-info -S
before and after)