fix(qemu): add setup detection and boot marker file creation

- Create windows.boot marker file if missing (fixes boot hang)
- Add /storage directory existence check before file creation
- Detect initial setup mode via /custom.iso presence
- Skip tail -f during setup to allow container exit
- Keep container alive only during normal runtime

Fixes issues:
- Container now exits properly after golden image creation
- Boot from golden image no longer hangs indefinitely
- Automatic distinction between setup and runtime modes

libs/qemu/src/entry.sh

@@ -3,12 +3,17 @@
 # Fix for Azure ML Job not using the correct root path
 cd /
 
+# Create windows.boot file if it doesn't exist (required for proper boot)
+if [ -d "/storage" -a ! -f "/storage/windows.boot" ]; then
+  echo "Creating windows.boot file in /storage..."
+  touch /storage/windows.boot
+fi
+
 # Start the VM in the background
 echo "Starting Windows VM..."
 /usr/bin/tini -s /run/entry.sh &
 echo "Live stream accessible at localhost:8006"
 
-# Wait for the VM to start up and CUA computer-server to be ready
 echo "Waiting for Windows to boot and CUA computer-server to start..."
 while true; do
   # Send a GET request to check if server is ready
@@ -33,6 +38,9 @@ socat TCP-LISTEN:5000,fork,reuseaddr TCP:20.20.20.21:5000 &
 
 echo "Computer server accessible at localhost:5000"
 
-# Keep container alive
-echo "Container running. Press Ctrl+C to stop."
-tail -f /dev/null
+# Detect initial setup by presence of /custom.iso (setup ISO mount)
+if [ ! -f "/custom.iso" ]; then
+  # Keep container alive
+  echo "Container running. Press Ctrl+C to stop."
+  tail -f /dev/null
+fi