add desktop_user to docker group

tasks/main.yml

@@ -90,3 +90,9 @@
     method: user
   become_user: "{{ desktop_user }}"
   loop: "{{ flatpak_packages }}"
+
+- name: "Add {{ desktop_user}} to the docker group"
+  user:
+    name: "{{ desktop_user }}"
+    groups: docker
+    append: yes