[NixOS] Add separate gitea-runner configuration

nixos/gitea-runner.nix

@@ -0,0 +1,50 @@
+{ pkgs, config, makeEnable, ... }:
+makeEnable config "modules.gitea-runner" false {
+  age.secrets.gitea-runner-token = {
+    file = ./secrets/gitea-runner-token.${config.networking.hostName}.age;
+    owner = "gitea";
+    group = "docker";
+  };
+
+    services.gitea-actions-runner.instances.nix =
+    let gitea-runner-directory = "/var/lib/gitea-runner";
+    in {
+      settings = {
+        cache = {
+          enabled = true;
+        };
+        container = {
+          workdir_parent = "${gitea-runner-directory}/workspace";
+        };
+        host = {
+          workdir_parent = "${gitea-runner-directory}/action-cache-dir";
+        };
+      };
+      hostPackages = with pkgs; [
+        bash
+        coreutils
+        curl
+        gawk
+        git-lfs
+        nixFlakes
+        gitFull
+        gnused
+        nodejs
+        wget
+      ];
+      enable = true;
+      name = config.networking.hostName;
+      url = "http://1896Folsom.duckdns.org:3000";
+      tokenFile = config.age.secrets.gitea-runner-token.path;
+      labels = [
+        "nixos-${pkgs.system}:host"
+        "nix:docker://localhost:5921/nix-runner"
+      ];
+    };
+
+    systemd.services.gitea-runner-nix.environment =
+      let gitea-runner-directory = "/var/lib/gitea-runner"; in {
+        XDG_CONFIG_HOME = gitea-runner-directory;
+        XDG_CACHE_HOME = "${gitea-runner-directory}/.cache";
+      };
+}