revert bd3861c580

revert Merge pull request 'Remove clanModules/*' (#4202) from remove-modules into main

Reviewed-on: https://git.clan.lol/clan/clan-core/pulls/4202

See: https://git.clan.lol/clan/clan-core/issues/4365

Not all modules are migrated.
If they are not migrated, we need to write migration docs and please display the link to the migration docs

clanModules/flake-module.nix

@@ -1,23 +1,51 @@
-{ ... }:
-
+{ lib, ... }:
 let
-  error = builtins.throw ''
-    clanModules have been removed!
-
-    Refer to https://docs.clan.lol/guides/migrations/migrate-inventory-services for migration.
-  '';
+  inherit (lib)
+    filterAttrs
+    pathExists
+    ;
 in
-
 {
-  flake.clanModules = {
-    outPath = "removed-clan-modules";
-    value = error;
+  # only import available files, as this allows to filter the files for tests.
+  flake.clanModules = filterAttrs (_name: pathExists) {
+    auto-upgrade = ./auto-upgrade;
+    admin = ./admin;
+    borgbackup = ./borgbackup;
+    borgbackup-static = ./borgbackup-static;
+    deltachat = ./deltachat;
+    data-mesher = ./data-mesher;
+    disk-id = ./disk-id;
+    dyndns = ./dyndns;
+    ergochat = ./ergochat;
+    garage = ./garage;
+    heisenbridge = ./heisenbridge;
+    importer = ./importer;
+    iwd = ./iwd;
+    localbackup = ./localbackup;
+    localsend = ./localsend;
+    matrix-synapse = ./matrix-synapse;
+    moonlight = ./moonlight;
+    mumble = ./mumble;
+    mycelium = ./mycelium;
+    nginx = ./nginx;
+    packages = ./packages;
+    postgresql = ./postgresql;
+    root-password = ./root-password;
+    single-disk = ./single-disk;
+    sshd = ./sshd;
+    state-version = ./state-version;
+    static-hosts = ./static-hosts;
+    sunshine = ./sunshine;
+    syncthing = ./syncthing;
+    syncthing-static-peers = ./syncthing-static-peers;
+    thelounge = ./thelounge;
+    trusted-nix-caches = ./trusted-nix-caches;
+    user-password = ./user-password;
+    vaultwarden = ./vaultwarden;
+    wifi = ./wifi;
+    xfce = ./xfce;
+    zerotier = ./zerotier;
+    zerotier-static-peers = ./zerotier-static-peers;
+    zt-tcp-relay = ./zt-tcp-relay;
   };
-
-  # builtins.listToAttrs (
-  #   map (name: {
-  #     inherit name;
-  #     value = error;
-  #   }) modnames
-  # );
 }