System/Servenix: Add initial servenix system configuration

system/services/gitea-runner.nix

@@ -0,0 +1,39 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: {
+  virtualisation.oci-containers.containers.gitea-runner = {
+    image = "gitea/act_runner:latest"; # NOTE: vegardit has other runner images
+    autoStart = true;
+
+    dependsOn = [];
+
+    ports = [];
+
+    volumes = [
+      "gitea-runner_data:/data"
+      "gitea-runner_config:/config" # Managed by env variables for vegardit image
+    
+      "/var/run/docker.sock:/var/run/docker.sock" # Disable for dind
+    ];
+
+    environment = {
+      # NOTE: gitlab.local.chriphost.de doesn't work, because it gets resolved to 192.168.86.25:443, which is nginx
+      GITEA_INSTANCE_URL = "http://192.168.86.25:3000";
+      GITEA_RUNNER_NAME = "servenix";
+
+      # Can be generated from inside the container using act_runner generate-config > /config/config.yaml
+      CONFIG_FILE = "/config/config.yaml";
+
+      # NOTE: This token is invalid, when re-registering is needed it has to be refreshed
+      GITEA_RUNNER_REGISTRATION_TOKEN = "Mq6wr0dPthqDij3iaryP8s5VYZA5kPfOQbHA6wm6";
+    };
+
+    extraOptions = [
+      # "--privileged" # Enable for dind
+      "--net=behind-nginx"
+    ];
+  };
+}