ci: fix linter errors: cron-tasks.sh

scripts/cron-tasks.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 set -e
-[[ ! -z "$DEBUG" ]] && set -x
+[[ -n "$DEBUG" ]] && set -x
 
 source /nextcloud-exec.sh
 
@@ -24,7 +24,7 @@ run_scripts_in_dir() {
     find . -type f -name '*.sh' -print0 |
     while IFS= read -r -d '' file; do
         echo "> Running Script: $file"
-        nextcloud_exec "$containerId" "$(cat $file)" || continue
+        nextcloud_exec "$containerId" "$(cat "$file")" || continue
     done
 }