enable systemd-oomd

Further configuration tuning could be useful, but the Fedora defaults
provided by the AUR package seem reasonable. This successfully kills
runaway processes for me, tested by running:

    $ systemd-run --user tail /dev/zero

Closes #111

playbook.yml

@@ -94,6 +94,7 @@
     - { role: ripgrep, tags: ['ripgrep'] }
     - { role: zeal, tags: ['zeal'] }
     - { role: kdeconnect, tags: ['kdeconnect'] }
+    - { role: oomd, tags: ['oomd'] }
   vars_prompt:
     - name: user_password
       prompt: "Enter desired user password"

roles/oomd/meta/main.yml

@@ -0,0 +1,3 @@
+---
+dependencies:
+  - { role: systemd }

roles/oomd/tasks/main.yml

@@ -0,0 +1,15 @@
+---
+- name: Install Fedora systemd-oomd configuration
+  aur:
+      name: systemd-oomd-defaults
+      user: "{{ user.name }}"
+  notify:
+    - reload systemd config
+  tags:
+    - aur
+
+- name: Enable and start systemd-oomd
+  service:
+    name: systemd-oomd.service
+    enabled: yes
+    state: started