Specify Raspbian playbook for Buster and below (#119)

* Call Raspbian role only when Release is older than 11 (Bullseye)

* Rename raspbian-role to mark that it is intended for Buster and lower

Wireguard is directly supported by Raspbian 11 (Bullseye) and higher.

* Add a note regarding the scope of the Raspbian playbook

tasks/setup-debian-raspbian-buster.yml

@@ -2,6 +2,12 @@
 # Copyright (C) 2020 Stefan Haun
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+# Note: This setup is called for Raspbian 10 (Buster) and lower.
+#       Since Raspbian 11 (Bullseye) wireguard is supported out
+#       of the box.
+#       Any Raspbian-related changes for Bullseye and above need to
+#       go to a separate playbook.
+
 - name: (Raspbian) Install GPG - required to add WireGuard key
   ansible.builtin.apt:
     name: gnupg

tasks/setup-debian.yml

@@ -5,11 +5,14 @@
 
 - name: Setup for Raspbian
   ansible.builtin.include_tasks:
-    file: "setup-debian-raspbian.yml"
+    file: "setup-debian-raspbian-buster.yml"
     apply:
       tags:
         - wg-install
-  when: ansible_lsb.id is defined and ansible_lsb.id == "Raspbian"
+  when:
+  - ansible_lsb.id is defined
+  - ansible_lsb.id == "Raspbian"
+  - ansible_lsb.major_release is version('11', '<')
   register: wireguard__register_raspbian_setup
 
 - name: Setup for Proxmox VE variants