fix s3 storage provider not ensuring data dir

This path is accessed by the s3 storage provider stuff and needs to be
ensured.

Broken by 7c5c3aedc

roles/custom/matrix-synapse/defaults/main.yml

@@ -61,6 +61,7 @@ matrix_synapse_ext_path: "{{ matrix_synapse_base_path }}/ext"
 
 matrix_synapse_ext_s3_storage_provider_base_path: "{{ matrix_synapse_base_path }}/ext/s3-storage-provider"
 matrix_synapse_ext_s3_storage_provider_bin_path: "{{ matrix_synapse_ext_s3_storage_provider_base_path }}/bin"
+matrix_synapse_ext_s3_storage_provider_data_path: "{{ matrix_synapse_ext_s3_storage_provider_base_path }}/data"
 
 matrix_synapse_container_client_api_port: 8008
 

roles/custom/matrix-synapse/tasks/setup_install.yml

@@ -16,6 +16,7 @@
 
     - {path: "{{ matrix_synapse_ext_s3_storage_provider_base_path }}", when: "{{ matrix_synapse_ext_synapse_s3_storage_provider_enabled }}"}
     - {path: "{{ matrix_synapse_ext_s3_storage_provider_bin_path }}", when: "{{ matrix_synapse_ext_synapse_s3_storage_provider_enabled }}"}
+    - {path: "{{ matrix_synapse_ext_s3_storage_provider_data_path }}", when: "{{ matrix_synapse_ext_synapse_s3_storage_provider_enabled }}"}
 
     # We handle matrix_synapse_media_store_path elsewhere (in ./synapse/setup_install.yml),
     # because if it's using Goofys and it's already mounted (from before),