You can disable coredump function of systemd by adding this line
For your reference:
Storage= Controls where to store cores. One of "none", "external", "journal", and "both". When "none", the coredumps will be logged but not stored permanently. When "external" (the default), cores will be stored in /var/lib/systemd/coredump. When "journal", cores will be stored in the journal and rotated following normal journal rotation patterns. When "both", cores will be stored in both locations. When cores are stored in the journal, they might be compressed following journal compression settings, see journald.conf(5). When cores are stored externally, they will be compressed by default, see below.