become_user: "{{ kolibri_user }}" to run as pi

"desktop user’s account is preferred" required to avoid errors like "You are running this command as the user 'kolibri', but Kolibri was originally installed to run as the user 'pi'."

As recommended by https://kolibri.readthedocs.io/en/latest/install.html#changing-the-owner-of-kolibri-system-service

roles/kolibri/tasks/main.yml

@@ -81,11 +81,15 @@
 - name: Run Kolibri migrations (WHY? WHAT DOES THIS DO?)
   shell: export KOLIBRI_HOME="{{ kolibri_home }}" && "{{ kolibri_exec_path }}" manage migrate
   ignore_errors: yes
+  become: yes
+  become_user: "{{ kolibri_user }}"
   when: kolibri_provision | bool
 
 - name: Set Kolibri default language
   shell: export KOLIBRI_HOME="{{ kolibri_home }}" && "{{ kolibri_exec_path }}" language setdefault "{{ kolibri_language }}"
   ignore_errors: yes
+  become: yes
+  become_user: "{{ kolibri_user }}"
   when: kolibri_provision | bool
 
 - name: Create Kolibri default facility name, admin account and language
@@ -95,6 +99,8 @@
     --superusername "{{ kolibri_admin_user }}" --superuserpassword "{{ kolibri_admin_password }}"
     --preset "{{ kolibri_preset }}" --language_id "{{ kolibri_language }}" --verbosity 0 --noinput
   ignore_errors: yes
+  become: yes
+  become_user: "{{ kolibri_user }}"
   when: kolibri_provision | bool
 
 - name: chown -R {{ kolibri_user }}:{{ apache_user }} {{ kolibri_home }}