ref(playbook): Change to role-based structure

roles/display_manager/tasks/main.yaml

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+---
+- name: Ensure user group for greeter exists
+  ansible.builtin.group:
+    name: "{{ greeter_user }}"
+    state: present
+
+- name: Install greetd and tuigreet
+  community.general.xbps:
+    name:
+      - greetd
+      - tuigreet
+    state: present
+  tags:
+    - packages
+
+- name: Set up tuigreet config for greetd
+  ansible.builtin.template:
+    src: greetd-config.toml.j2
+    dest: "/etc/greetd/config.toml"
+    owner: root
+    group: root
+    mode: 0644
+    force: true
+
+- name: Activate greetd service
+  ansible.builtin.file:
+    src: "/etc/sv/greetd"
+    dest: "/etc/runit/runsvdir/default/greetd"
+    state: link

roles/display_manager/templates/greetd-config.toml.j2

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+[terminal]
+# The VT to run the greeter on. Can be "next", "current" or a number
+# designating the VT.
+vt = 7
+
+# The default session, also known as the greeter.
+[default_session]
+command = "tuigreet --cmd zsh"
+user = "{{ greeter_user }}"
+
+# `agreety` is the bundled agetty/login-lookalike. You can replace `/bin/sh`
+# with whatever you want started, such as `sway`.
+# command = "agreety --cmd /bin/sh"
+
+# The user to run the command as. The privileges this user must have depends
+# on the greeter. A graphical greeter may for example require the user to be
+# in the `video` group.
+#user = "_greeter"

roles/display_manager/vars/main.yaml

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+---
+greeter_user: _greeter