Add gitlab-runner :^)

hive.nix

@@ -87,6 +87,49 @@ in
             user = "coffee-kai";
           };
         };
+
+        gitlab-runner = {
+          enable = true;
+          services = {
+            nix = {
+              registrationConfigFile = "/run/secrets/gitlab-runner-registration";
+
+              dockerImage = "alpine";
+              dockerVolumes = [
+                "/nix/store:/nix/store:ro"
+                "/nix/var/nix/db:/nix/var/nix/db:ro"
+                "/nix/var/nix/daemon-socket:/nix/var/nix/daemon-socket:ro"
+              ];
+              dockerDisableCache = true;
+
+              preBuildScript = pkgs.writeScript "setup-container" ''
+                mkdir -p -m 0755 /nix/var/log/nix/drvs
+                mkdir -p -m 0755 /nix/var/nix/gcroots
+                mkdir -p -m 0755 /nix/var/nix/profiles
+                mkdir -p -m 0755 /nix/var/nix/temproots
+                mkdir -p -m 0755 /nix/var/nix/userpool
+                mkdir -p -m 1777 /nix/var/nix/gcroots/per-user
+                mkdir -p -m 1777 /nix/var/nix/profiles/per-user
+                mkdir -p -m 0755 /nix/var/nix/profiles/per-user/root
+                mkdir -p -m 0700 "$HOME/.nix-defexpr"
+                . ${pkgs.nix}/etc/profile.d/nix-daemon.sh
+                ${pkgs.nix}/bin/nix-channel --add https://nixos.org/channels/nixos-25.05 nixpkgs
+                ${pkgs.nix}/bin/nix-channel --update nixpkgs
+                ${pkgs.nix}/bin/nix-env -i ${pkgs.lib.concatStringsSep " " (with pkgs; [ nix cacert git openssh ])}
+              '';
+
+              environmentVariables = {
+                ENV = "/etc/profile";
+                USER = "root";
+                NIX_REMOTE = "daemon";
+                PATH = "/nix/var/nix/profiles/default/bin:/nix/var/nix/profiles/default/sbin:/bin:/sbin:/usr/bin:/usr/sbin";
+                NIX_SSL_CERT_FILE = "/nix/var/nix/profiles/system/etc/ssl/certs/ca-bundle.crt";
+              };
+
+              tagList = [ "nix" ];
+            };
+          };
+        };
       };
 
       systemd.user.services.krdp = {

hosts/hashmap/configuration.nix

@@ -10,6 +10,11 @@
 
   boot = {
     consoleLogLevel = 3;
+    kernel = {
+      sysctl = {
+        "net.ipv4.ip_forward" = true;
+      };
+    };
     kernelParams = [
       # Quite boot
       "quiet"