add gitlab runner

hosts/pluto/services/gitlab.nix

@@ -1,6 +1,7 @@
 {
   config,
   pkgs,
+  lib,
   ...
 }: let
   sec = config.age.secrets;
@@ -33,6 +34,50 @@ in {
       owner = user;
       group = group;
     };
+    gitlab_runner = {
+      file = ../../../sec/gitlab_runner.age;
+    };
+  };
+
+  boot.kernel.sysctl."net.ipv4.ip_forward" = true; # 1
+
+  services.gitlab-runner = {
+    enable = true;
+    services = {
+      nix = with lib; {
+        registrationConfigFile = toString sec.gitlab_runner.path; # 2
+        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-20.09 nixpkgs # 3
+          ${pkgs.nix}/bin/nix-channel --update nixpkgs
+          ${pkgs.nix}/bin/nix-env -i ${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/default/etc/ssl/certs/ca-bundle.crt";
+        };
+        tagList = ["nix"];
+      };
+    };
   };
 
   services.gitlab = {

sec/gitlab_runner.age

@@ -0,0 +1,11 @@
+age-encryption.org/v1
+-> ssh-ed25519 gWMdNg ThgFlRapmGeAIyoDUQ2+tKv1q/b4Rgy7X3JOX4y7rB4
+ZICtha7UPSAUmiWmutknmXEBF7p2ZhFvPe7KLuFMx/Y
+-> ssh-ed25519 s+NXzQ zQLenQJvJrCdpvlJvtHPopKrQrqlFH0L/Y7jtvUDVhw
+xR2m63gVGI+jnh/hWUSKghu7j6bpj1KpqW4rvYFDqY8
+-> ssh-ed25519 yEtzbQ drQqQGrf/bc2QtBEI81yZ5kdwOq16sxANWm7+xqNZjc
+u5E1BGvzlTXUPZ1xgqjmCSnpf394NIjPFhgiZr3mwyk
+-> ssh-ed25519 RMNffg FsrnVqaaecYqmbMUud933IZrPB75BLvgRBrZzGN+VRQ
+8biX5ndZpebxQAEGHD/yNWAqa7v7HmdunsBDGZeefYY
+--- seSphJ/0UtLwFCgYFy0hT3EV88OmNALfnpANHuJE8Ow
+7LGÇwoUZíËïWtÁ	ÛÂÛnh²º»•DÂ6`Õ×=²ý+è}\ÞØÄ;WÒa5>oErn}e¤š‘¢ó<>{zeðÔÛ%ÎOíâZË:r#û’OUï<“ë<E2809C>©šä7ûÞåÓ¥…¢¦ÛŒDØ