Fix librewolf installation for Debian

roles/librewolf/files/librewolf.list

@@ -0,0 +1 @@
+deb [arch=amd64] http://deb.librewolf.net $distro main

roles/librewolf/handlers/main.yml

@@ -0,0 +1,5 @@
+---
+- name: Update apt cache
+  become: true
+  apt:
+    update_cache: true

roles/librewolf/tasks/main.yml

@@ -1,4 +1,6 @@
 ---
+- name: Install librewolf (Archlinux)
+  block:
     - name: Clone librewolf (Archlinux)
       git:
         repo: https://aur.archlinux.org/librewolf-bin.git
@@ -6,21 +8,37 @@
         clone: true
         update: false
         version: master
-  when: ansible_facts['distribution'] == 'Archlinux'
-
-- name: Add gpg key for librewolf
+    - name: Add gpg key for librewolf (Archlinux)
       command: gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys 031F7104E932F7BD7416E7F6D2845E1305D6E801
-  when: ansible_facts['distribution'] == 'Archlinux'
-
+      register: result
+      changed_when: "'unchanged: 1' not in result.stderr"
     - name: Make and install librewolf (Archlinux)
       command:
         cmd: makepkg -cirs --needed
         chdir: ~/builds/librewolf-bin
         stdin: Y
-  when: ansible_facts['distribution'] == 'Archlinux'
       register: result
       changed_when: "'installing existing package' not in result.stderr"
+  when: ansible_facts['distribution'] == 'Archlinux'
 
+- name: Install librewolf (Debian)
+  block:
+    - name: Copy librewolf.list (Debian)
+      become: true
+      copy:
+        src: librewolf.list
+        dest: /etc/apt/sources.list.d/librewolf.list
+        mode: 0644
+      notify: Update apt cache
+    - name: Add gpg key for librewolf (Debian)
+      become: true
+      get_url:
+        url: https://deb.librewolf.net/keyring.gpg
+        dest: /etc/apt/trusted.gpg.d/librewolf.gpg
+        mode: 0644
+      notify: Update apt cache
+    - name: Flush handlers
+      meta: flush_handlers
     - name: Install librewolf (Debian)
       become: true
       apt: