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nixos/modules/forgejo.nix

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+{ config, pkgs, ... }:
+
+let
+  # (Optional) name your Compose app’s directory on the VM:
+  composeDir = "/etc/docker-compose-app";
+
+in {
+  # 1) Install Docker engine and Docker‐Compose binary:
+  environment.systemPackages = with pkgs; [
+    docker
+    docker-compose      # pulls in the python-based compose
+  ];
+
+  # 2) Enable the Docker daemon:
+  services.docker.enable = true;
+
+  # 3) Create a directory for your Compose file and copy it from the flake:
+  #    If your flake repo has a sibling file `docker-compose.yml`, this will drop
+  #    it into /etc/docker-compose-app/docker-compose.yml on the VM.
+  environment.etc."docker-compose-app/docker-compose.yml".text = builtins.readFile ./docker-compose.yml;
+
+  # 4) Make sure that directory exists with the right permissions:
+  systemd.tmpfiles.rules = [
+    # D     = create directory if missing, mode 0755, owner root:root
+    "D! /etc/docker-compose-app 0755 root root - -"
+  ];
+
+  # 5) Define a systemd service to run `docker-compose up`:
+  systemd.services.dockerComposeApp = {
+    description = "docker-compose stack for my application";
+    after = [ "network-online.target" "docker.service" ];
+    wants = [ "network-online.target" "docker.service" ];
+
+    serviceConfig = {
+      # Run in foreground but let systemd restart if it crashes
+      ExecStart = "${pkgs.docker-compose}/bin/docker-compose -f ${composeDir}/docker-compose.yml up";
+      ExecStop  = "${pkgs.docker-compose}/bin/docker-compose -f ${composeDir}/docker-compose.yml down";
+      WorkingDirectory = composeDir;
+      Restart = "always";
+      RestartSec = 10;
+    };
+
+    # Make sure the directory exists before this service starts:
+    preStart = ''
+      mkdir -p ${composeDir}
+      chown root:root ${composeDir}
+    '';
+
+    wantedBy = [ "multi-user.target" ];
+  };
+
+  # 6) (Optional) If any volumes need to exist, define them here, for example:
+  #    environment.etc."docker-compose-app/data".source = "/path/to/local/data";
+}