arr-init: add module for API-based configuration

services/arr/prowlarr.nix

@@ -19,6 +19,10 @@
     settings.server.port = service_configs.ports.prowlarr;
   };
 
+  systemd.services.prowlarr.serviceConfig = {
+    ExecStartPre = "+${pkgs.coreutils}/bin/chown -R prowlarr /var/lib/prowlarr";
+  };
+
   services.caddy.virtualHosts."prowlarr.${service_configs.https.domain}".extraConfig = ''
     import ${config.age.secrets.caddy_auth.path}
     reverse_proxy ${config.vpnNamespaces.wg.namespaceAddress}:${builtins.toString service_configs.ports.prowlarr}