Allow choosing between iwd and wpa_supplicant

hosts/nixos/common/optional/services/wpa_supplicant.nix

@@ -0,0 +1,57 @@
+{ config, ... }:
+{
+  sops.secrets.wireless.sopsFile = ../../secrets.yaml;
+
+  # https://github.com/NixOS/nixpkgs/blob/nixos-22.11/nixos/modules/services/networking/wpa_supplicant.nix
+  networking.wireless = {
+    enable = true;
+    fallbackToWPA2 = false;
+
+    # Declarative
+    environmentFile = config.sops.secrets.wireless.path;
+    networks = {
+      "Neptune".psk = "@ENCELADUS_HOTSPOT_PASS@";
+
+      "Familia-Matei-PRO".psk = "@TG_HOTSPOT_HOME_PASS@";
+      "Familia-Matei".psk = "@TG_HOTSPOT_HOME_PASS@";
+
+      "R15-5365 5g".psk = "@TG_WIFI_HOME_PASS@";
+      "R15-5365".psk = "@TG_WIFI_HOME_PASS@";
+
+      "Sailhorse".psk = "@NL_PLACE_0_PASS@";
+      "Ziggo1721699".psk = "@NL_PLACE_1_PASS@";
+      "Konijntjes".psk = "@NL_PLACE_1_PODS_PASS@";
+      "InfoEdu12".psk = "@INFOEDU_PASS@";
+      "CNU19".psk = "@INFOEDU_PASS@";
+      "ZTE_F7A321".psk = "@MADALINA_PASS@";
+
+      # [Working solution](https://bbs.archlinux.org/viewtopic.php?id=271336)
+      # [Other interesting link](https://help.itc.rwth-aachen.de/en/service/b3d9a2c8ae5345b8b8f5128143ef4e3c/article/eaf6d69389a74a5a839c1f383c508df7/)
+      # [Uni link](https://lwpwiki.webhosting.rug.nl/index.php/Configure_your_wifi_for_Eduroam)
+      "eduroam" = {
+        authProtocols = [ "WPA-EAP" ];
+        auth = ''
+          eap=PEAP
+          identity="s5260329@rug.nl"
+          password="@EDUROAM_PASS@"
+        '';
+        extraConfig = ''
+          phase2="auth=MSCHAPV2"
+        '';
+      };
+    };
+
+    # Imperative
+    allowAuxiliaryImperativeNetworks = true;
+    userControlled = {
+      enable = true;
+      group = "network";
+    };
+  };
+
+  # Ensure group exists
+  users.groups.network = { };
+
+  # The service seems to fail if this file does not exist
+  systemd.tmpfiles.rules = [ "f /etc/wpa_supplicant.conf" ];
+}