fix: cd to lib dir in wrapper so drizzle migrations can find _journal.json

process.cwd() defaults to / (systemd default) without an
explicit WorkingDirectory. The migration code looks for
drizzle/migrations/meta/_journal.json relative to cwd,
so the wrapper must cd into the package directory first.

flake.nix

@@ -84,7 +84,8 @@
             mkdir -p $out/bin
             cat > $out/bin/gmw-backend << WRAPPER
 #!${pkgs.runtimeShell}
-exec ${nodejs}/bin/node $out/lib/gmw-backend/dist/index.js
+cd $out/lib/gmw-backend
+exec ${nodejs}/bin/node dist/index.js
 WRAPPER
             chmod +x $out/bin/gmw-backend
           '';
@@ -152,7 +153,8 @@ WRAPPER
             mkdir -p $out/bin
             cat > $out/bin/gmw-discord-gateway << WRAPPER
 #!${pkgs.runtimeShell}
-exec ${nodejs}/bin/node $out/lib/gmw-discord-gateway/dist/index.js
+cd $out/lib/gmw-discord-gateway
+exec ${nodejs}/bin/node dist/index.js
 WRAPPER
             chmod +x $out/bin/gmw-discord-gateway
           '';