wine cmd.exe /c "timeout /t 900 > nul" failed silently (docker exec -d
hides errors), leaving no anchor process and letting wineserver die as
soon as EAappInstaller.exe exited.
Replace with wineserver -f (foreground mode) which keeps the server
alive unconditionally until explicitly killed with wineserver -k.
This is the correct primitive for holding a Wine session open.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01D8ckUJQtj1pH8jtAddBDZs