feat(forgejo-runners): Use a multiuser nix installation

machines/nixos/build01/_configuration.nix

@@ -11,11 +11,12 @@ lib.extra.mkConfig {
 
   enabledServices = [
     "nix-builder"
+    "forgejo-multiuser-runner"
   ];
 
   extraConfig = {
     dgn-forgejo-runners = {
-      nbRunners = 16;
+      nbRunners = 32;
       dataDirectory = "/data";
     };
 

machines/nixos/build01/forgejo-multiuser-runner.nix

@@ -0,0 +1,43 @@
+# SPDX-FileCopyrightText: 2025 Maurice Debray <maurice.debray@dgnum.eu>
+#
+# SPDX-License-Identifier: EUPL-1.2
+
+{
+  name,
+  pkgs,
+  config,
+  ...
+}:
+{
+  services.forgejo-multiuser-nix-runners = {
+    enable = true;
+
+    url = "https://git.dgnum.eu";
+
+    storePath = "/data/multiuser-nix";
+    tokenFile = config.age.secrets."forgejo_runners-token_file".path;
+    names = [
+      "on-${name}"
+      "nix"
+    ];
+
+    dependencies = [
+      pkgs.tea
+    ];
+
+    containerOptions = [ "--cpus=4" ];
+
+    nbRunners = 8;
+  };
+
+  virtualisation = {
+    podman = {
+      enable = true;
+
+      defaultNetwork.settings = {
+        dns_enable = true;
+        ipv6_enabled = true;
+      };
+    };
+  };
+}