Completely change runner approach

system-specific/oracles/gitlab-runner.nix

@@ -14,36 +14,11 @@
   services.gitlab-runner =
     let
       nix-shared = with lib; {
-        dockerImage = "alpine:latest";
+        dockerImage = "nixpkgs/nix-flakes";
         dockerVolumes = [
-          "/nix/store:/nix/store:ro"
+          "/nix:/sharedstore"
-          "/nix/var/nix/db:/nix/var/nix/db:ro"
-          "/nix/var/nix/daemon-socket:/nix/var/nix/daemon-socket:ro"
-          "/var/lib/secret/cache:/var/lib/secret/cache"
         ];
         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.sh
-          ${pkgs.nix}/bin/nix-channel --add https://nixos.org/channels/nixos-21.11 nixpkgs # 3
-          ${pkgs.nix}/bin/nix-channel --update nixpkgs
-          ${pkgs.nix}/bin/nix-env -i ${concatStringsSep " " (with pkgs; [ nixUnstable 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";
-        };
       };
     in
     {