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

@@ -1,31 +1,49 @@
 ---
-- name: Clone librewolf (Archlinux)
-  git:
-    repo: https://aur.archlinux.org/librewolf-bin.git
-    dest: ~/builds/librewolf-bin
-    clone: true
-    update: false
-    version: master
+- name: Install librewolf (Archlinux)
+  block:
+    - name: Clone librewolf (Archlinux)
+      git:
+        repo: https://aur.archlinux.org/librewolf-bin.git
+        dest: ~/builds/librewolf-bin
+        clone: true
+        update: false
+        version: master
+    - name: Add gpg key for librewolf (Archlinux)
+      command: gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys 031F7104E932F7BD7416E7F6D2845E1305D6E801
+      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
+      register: result
+      changed_when: "'installing existing package' not in result.stderr"
   when: ansible_facts['distribution'] == 'Archlinux'
 
-- name: Add gpg key for librewolf
-  command: gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys 031F7104E932F7BD7416E7F6D2845E1305D6E801
-  when: ansible_facts['distribution'] == 'Archlinux'
-
-- 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"
-
 - name: Install librewolf (Debian)
-  become: true
-  apt:
-    name:
-      - librewolf
+  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:
+        name:
+          - librewolf
   when: ansible_facts['distribution'] == 'Debian'
 
 - name: Open addon pages for installation