Fix Bash syntax error in disable_opcache JPS action - simplify error detection

mbadmin.jps

@@ -655,20 +655,11 @@ actions:
         commands:
           - |
             set -euo pipefail
-            TMP_OUTPUT="$(mktemp)"
-            cleanup() {
-              rm -f "${TMP_OUTPUT}"
-            }
-            trap cleanup EXIT
-
-            php /home/litespeed/mbmanager/scripts/toggle_opcache.php disable > "${TMP_OUTPUT}"
-
-            if grep -Eq '"status"[[:space:]]*:[[:space:]]*"error"' "${TMP_OUTPUT}"; then
-              cat "${TMP_OUTPUT}"
+            OUTPUT=$(php /home/litespeed/mbmanager/scripts/toggle_opcache.php disable 2>&1)
+            echo "$OUTPUT"
+            if echo "$OUTPUT" | grep -q '"status".*:.*"error"'; then
               exit 1
             fi
-
-            cat "${TMP_OUTPUT}"
     - restartNodes:
         - nodeGroup: "cp"
           reboot: true