setup-apkrepos: use cdn as default answer

use '1', which should be dl-cdn, as the default answer

setup-apkrepos.in

@@ -175,7 +175,7 @@ if [ -r "$APKREPOS_PATH" ]; then
 fi
 
 get_alpine_release
-default_answer=f
+default_answer=1
 changed=false
 
 if [ $# -gt 0 ]; then