Add Service Discovery (/.well-known/matrix/client) support

roles/matrix-server/templates/nginx-conf.d/matrix-synapse.conf.j2

@@ -39,6 +39,12 @@ server {
 	ssl_prefer_server_ciphers on;
 	ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";
 
+	location /.well-known/matrix/client {
+		root {{ matrix_static_files_base_path }};
+		expires 1m;
+		default_type application/json;
+	}
+
 	{% if matrix_corporal_enabled and matrix_corporal_http_api_enabled %}
 	location /_matrix/corporal {
 		{% if matrix_nginx_proxy_enabled %}

roles/matrix-server/templates/systemd/matrix-nginx-proxy.service.j2

@@ -23,6 +23,7 @@ ExecStart=/usr/bin/docker run --rm --name matrix-nginx-proxy \
 			-p 443:443 \
 			-v {{ matrix_nginx_proxy_confd_path }}:/etc/nginx/conf.d:ro \
 			-v {{ matrix_ssl_config_dir_path }}:{{ matrix_ssl_config_dir_path }}:ro \
+			-v {{ matrix_static_files_base_path }}:{{ matrix_static_files_base_path }}:ro \
 			{{ matrix_docker_image_nginx }}
 ExecStop=-/usr/bin/docker kill matrix-nginx-proxy
 ExecStop=-/usr/bin/docker rm matrix-nginx-proxy

roles/matrix-server/templates/well-known/matrix-client.j2

@@ -0,0 +1,8 @@
+{
+	"m.homeserver": {
+		"base_url": "{{ matrix_homeserver_url }}"
+	},
+	"m.identity_server": {
+		"base_url": "{{ matrix_identity_server_url }}"
+	}
+}