Test role swap

It is slightly awkward to include the swap_size variable with the
playbook in "pull" mode since the hosts file cannot really be used
to set different swap sizes for different hosts at the same time.
I guess this is one of the downsides compared to "push".

hosts.yml

@@ -4,3 +4,5 @@ all:
     local:
       hosts:
         localhost:
+          # RAM is 16 GB
+          swap_size: 16384

local.yml

@@ -18,12 +18,17 @@
       tags: always
 
   roles:
+    # https://codeberg.org/ansible/common
     - { role: common,                 become: true, tags: [ common ] }
+    # https://codeberg.org/ansible/common-systools
     - { role: common-systools,        become: true, tags: [ common ] }
     - { role: dotfiles,                             tags: [ dotfiles ] }
+    # https://codeberg.org/ansible/locales
     - { role: locales,                become: true, tags: [ locales ] }
+    # https://codeberg.org/ansible/ssh
     - { role: ssh,                    become: true, tags: [ ssh ] }
-    # - { role: swap,                   become: true, tags: [ swap ] }
+    # https://codeberg.org/ansible/swap
+    - { role: swap,                   become: true, tags: [ swap ] }
     # - { role: mounts-remote,          become: true, tags: [ mounts-remote ] }
     # jietop will need a different desktop by default (not GNOME, but something else)
     # but perhaps we still want rofi/dmenu anyway?