copr-builder: experiment with disabled kernel OOM killer

Relates: rhbz#2051154

roles/copr/backend/files/provision/provision_builder_tasks.yml

@@ -120,12 +120,18 @@
   no_log: true
   when: prepare_base_image is not defined
 
-- name: stop and disable systemd-oomd
+- name: stop and disable systemd-oomd, rhbz 2051154
   service:
     name: systemd-oomd
     state: stopped
     enabled: no
 
+- name: disable kernel oom-killer, too, rhbz 2051154
+  sysctl:
+    name: vm.oom-kill
+    value: 0
+    state=present
+
 - name: install copr-builder and other latest packages
   dnf: state=latest pkg={{ packages }}
   vars: