Add matrix-synapse-rest-auth support

roles/matrix-server/tasks/setup_synapse_pre.yml

@@ -0,0 +1,17 @@
+---
+
+- name: Ensure Matrix Synapse paths exist
+  file:
+    path: "{{ item }}"
+    state: directory
+    mode: 0750
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_username }}"
+  with_items:
+    - "{{ matrix_synapse_config_dir_path }}"
+    - "{{ matrix_synapse_run_path }}"
+    - "{{ matrix_synapse_storage_path }}"
+    - "{{ matrix_synapse_ext_path }}"
+    # We handle matrix_synapse_media_store_path elsewhere (in setup_synapse.yml),
+    # because if it's using S3fs and it's already mounted (from before),
+    # trying to chown/chmod it here will cause trouble.