copr: builder: drop the baked-in-image mock.cfg.j2 config

roles/copr/backend/files/provision/provision_builder_tasks.yml

@@ -38,6 +38,12 @@
   when:
     - prepare_base_image is defined
 
+- package_facts: manager=auto
+
+- name: remove the baked-in-image mock.cfg.j2, will be reinstalled
+  file: patht=/etc/copr-rpmbuild/mock.cfg.j2 state=absent
+  when: ansible_facts.packages['copr-builder'][0].version is version('0.31', '<=')
+
 - name: install copr-builder and other latest packages
   dnf: state=latest pkg="{{ packages }}"
   vars: