Add dont-chroot setting to settings.conf.

settings.conf

@@ -76,3 +76,10 @@ branding: default
 # install phase, i.e. at the point of no return. If it's false, no prompt is shown.
 # Default is false.
 prompt-install: false
+
+# If this is set to true, all target environment calls will be executed on the current
+# (host) system rather than on the target (chrooted) system.
+# Only set this to true in exceptional circumstances, if you are not using Calamares as
+# a system installer.
+# Default is false.
+dont-chroot: false