add redis support

roles/matrix-redis/defaults/main.yml

@@ -0,0 +1,22 @@
+matrix_redis_enabled: true
+
+matrix_redis_connection_password: ""
+
+matrix_redis_base_path: "{{ matrix_base_data_path }}/redis"
+matrix_redis_data_path: "{{ matrix_redis_base_path }}/data"
+
+matrix_redis_docker_image_v5: "redis:5.0-alpine"
+matrix_redis_docker_image_v6: "redis:6.0-alpine"
+matrix_redis_docker_image_latest: "{{ matrix_redis_docker_image_v6 }}"
+matrix_redis_docker_image_to_use: '{{ matrix_redis_docker_image_latest }}'
+
+matrix_redis_docker_image_force_pull: "{{ matrix_redis_docker_image_to_use.endswith(':latest') }}"
+
+# A list of extra arguments to pass to the container
+matrix_redis_container_extra_arguments: []
+
+# Controls whether the matrix-redis container exposes a port (tcp/6379 in the container)
+# that can be used to access redis from outside the container
+#
+# Takes an "<ip>:<port>" or "<port>" value (e.g. "127.0.0.1:6379"), or empty string to not expose.
+matrix_redis_container_redis_bind_port: ""