fix: support for Bash version 3 in daily.sh (#4347)

daily.sh

@@ -55,7 +55,12 @@ if [ -z "$arg" ]; then
     fi
 
     cnf=$(echo $(grep '\[.distributed_poller.\]' config.php | egrep -v -e '^//' -e '^#' | cut -d = -f 2 | sed 's/;//g'))
-    cnf=${cnf,,}
+    if ((${BASH_VERSINFO[0]} < 4)); then
+        cnf=`echo $cnf|tr [:upper:] [:lower:]`
+    else
+        cnf=${cnf,,}
+    fi
+
     if [ -z "$cnf" ] || [ "$cnf" == "0" ] || [ "$cnf" == "false" ]; then
         # Call ourself again in case above pull changed or added something to daily.sh
         $0 post-pull