Fail in a friendlier way when trying to self-build on Ansible <= 2.8

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1070

Related discussion here: 1ab507349c (commitcomment-51108407)

roles/matrix-synapse/tasks/init.yml

@@ -1,3 +1,10 @@
+# See https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1070
+# and https://github.com/spantaleev/matrix-docker-ansible-deploy/commit/1ab507349c752042d26def3e95884f6df8886b74#commitcomment-51108407
+- name: Fail if trying to self-build on Ansible < 2.8
+  fail:
+    msg: "To self-build the Element image, you should use Ansible 2.8 or higher. See docs/ansible.md"
+  when: "ansible_version.major == 2 and ansible_version.minor < 8 and matrix_synapse_container_image_self_build"
+
 # Unless `matrix_synapse_workers_enabled_list` is explicitly defined,
 # we'll generate it dynamically.
 - import_tasks: "{{ role_path }}/tasks/synapse/workers/init.yml"
@@ -17,10 +24,3 @@
 - set_fact:
     matrix_systemd_services_list: "{{ matrix_systemd_services_list + ['matrix-goofys.service'] }}"
   when: matrix_s3_media_store_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 Synapse 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_synapse_container_image_self_build"