System/Servenix: Add initial servenix system configuration

system/services/formula10.nix

@@ -0,0 +1,31 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: {
+  virtualisation.oci-containers.containers.formula10 = {
+    image = "gitea.vps.chriphost.de/christoph/formula10:latest";
+    autoStart = true;
+
+    dependsOn = [];
+
+    ports = [
+      "55555:5000"
+    ];
+
+    volumes = [
+      "formula10_data:/app/instance"
+      "formula10_cache:/cache"
+    ];
+
+    environment = {
+      TZ = "Europe/Berlin";
+    };
+
+    extraOptions = [
+      "--init" # Make an init process take up PID 1, to make python receive the SIGTERM
+      "--net=behind-nginx"
+    ];
+  };
+}