karakeep: use Node 22

The Karakeep SSO VM aborted in better-sqlite3's Statement destructor under Node 24.19.0, as observed in https://github.com/ibizaman/selfhostblocks/actions/runs/32601131491/job/97099512653.

This matches Node's deterministic reproducer for a Node 24.19 ObjectWrap cleanup regression at nodejs/node#65446. The fix is merged on Node main in nodejs/node#63985, but its Node 24 backport at nodejs/node#65042 remains open.

nixpkgs defaults to the affected Node 24.19. Node 26 does not enter LTS until October 2026, while Node 22 remains supported through April 2027 according to https://github.com/nodejs/Release#release-schedule. Use Node 22 as a temporary supported LTS workaround while preserving explicit package overrides.

Author: dniku

modules/services/karakeep.nix

@@ -1,6 +1,7 @@
 {
   config,
   lib,
+  pkgs,
   shb,
   ...
 }:
@@ -197,6 +198,13 @@ in
         services.karakeep = {
           enable = true;
           meilisearch.enable = true;
+          # Node 24.19 can abort ObjectWrap addons during GC. Use the supported
+          # Node 22 LTS until a fixed Node 24 reaches nixpkgs.
+          # https://github.com/nodejs/node/issues/65446
+          # Fixed on main: https://github.com/nodejs/node/pull/63985
+          # Pending Node 24 backport: https://github.com/nodejs/node/pull/65042
+          # https://github.com/nodejs/Release#release-schedule
+          package = lib.mkDefault (pkgs.karakeep.override { nodejs = pkgs.nodejs_22; });
 
           extraEnvironment = {
             PORT = toString cfg.port;