fix: make validation log file world writeable for seamless integration with NextCloud validation

validate_workflow.sh

@@ -422,6 +422,7 @@ exec_cmd() {
     start_t=$(date +"%s")
     debug "scan_file, calling cmd='${cmd}'"
         eval "${cmd} >>\"${log}\" 2>&1"
+    chmod o+w "${log}"
     local is_valid=$?
     check_argument_notempty "${is_valid}"
     stop_t=$(date +"%s")