fix(flatpak): install flatpak if not present

Signed-off-by: Matej Focko <me@mfocko.xyz>

roles/flatpak/tasks/install.yml

@@ -0,0 +1,6 @@
+---
+- name: Install the required packages
+  ansible.builtin.package:
+    name: flatpak
+    state: present
+  become: true

roles/flatpak/tasks/main.yml

@@ -1,4 +1,8 @@
 ---
+- name: Packages
+  ansible.builtin.include_tasks: install.yml
+  tags: install
+
 - name: Enable Flathub
   community.general.flatpak_remote:
     name: flathub