support running scripts specified on the command

Signed-off-by: Mattia Rizzolo <mapreri@ubuntu.com>

cron.sh

@@ -44,7 +44,14 @@ run_script() (
 )
 
 
+if [ $# -ne 0 ]; then
+    for i in "$@"; do
+        script="$base/$i"
+        run_script "$script"
+    done
+else
     # Try to deploy all the websites
     for script in "${base}/scripts/"*; do
         run_script "$script"
     done
+fi