Added a delay on systemd-nspawn

This to avoid "Transport endpoint is not connected"

archinstall/lib/systemd.py

@@ -1,4 +1,5 @@
 import logging
+import time
 from .general import SysCommand, SysCommandWorker, locate_binary
 from .installer import Installer
 from .output import log
@@ -60,6 +61,8 @@ class Boot:
 			self.session = existing_session.session
 			self.ready = existing_session.ready
 		else:
+			log(f"Temporarily booting up installed system using systemd-nspawn")
+			time.sleep(1)
 			self.session = SysCommandWorker([
 				'/usr/bin/systemd-nspawn',
 				'-D', self.instance.target,