Enable garmin-grafana on sisko

hosts/sisko/default.nix

@@ -35,6 +35,7 @@
       "mosh"
       "amule"
       "adguard-home"
+      "garmin-grafana"
     ]
     ++ [
       ./disko.nix

modules/garmin-grafana/default.nix

@@ -0,0 +1,53 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+let
+  garmin-grafana-flake = builtins.getFlake "github:NixOS/nixpkgs/1f03fefb44665cd2377912033de22ffaba2be48d";
+  inherit (garmin-grafana-flake.legacyPackages.${pkgs.system}) garmin-grafana;
+in
+{
+  users.users.garmin-grafana = {
+    isSystemUser = true;
+    group = "garmin-grafana";
+    extraGroups = [ "garmin-grafana" ];
+    home = "/var/lib/garmin-grafana";
+  };
+
+  users.groups.garmin-grafana = { };
+
+  systemd.services.garmin-grafana = {
+    description = "garmin-grafana";
+    wantedBy = [ "multi-user.target" ];
+    environment = {
+      INFLUXDB_HOST = "localhost";
+      INFLUXDB_PORT = "8086"; # it's hardcoded in the influxdb NixOS module
+      INFLUXDB_USERNAME = "garmin-grafana";
+      INFLUXDB_PASSWORD = "password"; # FIXME terrible but the databse is not exposed at least
+      INFLUXDB_DATABASE = "garmin-stats";
+      GARMINCONNECT_IS_CN = "False";
+      USER_TIMEZONE = "Europe/Rome";
+      KEEP_FIT_FILES = "True";
+      ALWAYS_PROCESS_FIT_FILES = "True";
+      # MANUAL_START_DATE = "2024-06-01";
+      # MANUAL_END_DATE = "2025-12-31";
+    };
+    serviceConfig = {
+      ExecStart = lib.getExe garmin-grafana;
+      Group = "garmin-grafana";
+      User = "garmin-grafana";
+      WorkingDirectory = "/var/lib/garmin-grafana";
+    };
+  };
+
+  # garmin-grafana uses influxdb V1, probably it's the only software I'll ever use using the V1
+  # so I"m keeping its declaration inside this module
+  services.influxdb.enable = true;
+
+  environment.persistence."/persist".directories = [
+    "/var/lib/garmin-grafana"
+    config.services.influxdb.dataDir
+  ];
+}