check ansible version for self-building in every role

roles/matrix-bridge-mautrix-facebook/tasks/init.yml

@@ -14,3 +14,10 @@
       +
       {{ ["/matrix-mautrix-facebook-registration.yaml"] }}
   when: matrix_mautrix_facebook_enabled|bool
+
+# ansible lower than 2.8, does not support docker_image build parameters
+# for self buildig it is explicitly needed, so we rather fail here
+- name: Fail if running on Ansible lower than 2.8 and trying self building
+  fail:
+    msg: "To self build Mautrix Facebook image, you should usa ansible 2.8 or higher. E.g. pip contains such packages."
+  when: "ansible_version.major == 2 and ansible_version.minor < 8 and matrix_mautrix_facebook_self_build"