feat: set opencode db path explicitly

configuration.nix

@@ -90,6 +90,7 @@
     serviceConfig = {
       Type = "simple";
       User = "jet";
+      Environment = [ "OPENCODE_DB=opencode.db" ];
       Restart = "always";
       RestartSec = 5;
       TimeoutStartSec = 75;

home-modules/lib.nix

@@ -16,6 +16,7 @@ let
     nativeBuildInputs = [ pkgs.makeWrapper ];
     postBuild = ''
       wrapProgram "$out/bin/opencode" \
+        --set OPENCODE_DB opencode.db \
         --prefix LD_LIBRARY_PATH : "${pkgs.lib.makeLibraryPath [ pkgs.stdenv.cc.cc.lib ]}"
     '';
   };