Compress mkinitcpio with lz4 on arch

playbook.yml

@@ -170,6 +170,19 @@
             NTP=0.arch.pool.ntp.org 1.arch.pool.ntp.org 2.arch.pool.ntp.org 3.arch.pool.ntp.org
             FallbackNTP=0.pool.ntp.org 1.pool.ntp.org 2.pool.ntp.org 3.pool.ntp.org
         become: true
+
+      - name: install lz4
+        package:
+          name: lz4
+          state: installed
+        become: true
+
+      - name: use lz4 for mkinitcpio compression
+        lineinfile:
+          path: /etc/mkinitcpio.conf
+          regexp: '^#?COMPRESSION=.*$'
+          line: 'COMPRESSION="lz4"'
+        become: true
       when: distro == 'archlinux'
 
     - set_fact: