Switch Docker image to official one

Switching from from avhost/docker-matrix (silviof/docker-matrix)
to matrixdotorg/synapse.

The avhost/docker-matrix (silviof/docker-matrix) image used to bundle
in the coturn STUN/TURN server, so as part of the move,
we're separating this to a separately-ran service
(matrix-coturn.service, powered by instrumentisto/coturn-docker-image)

roles/matrix-server/templates/coturn/turnserver.conf.j2

@@ -0,0 +1,15 @@
+lt-cred-mech
+use-auth-secret
+static-auth-secret={{ matrix_coturn_turn_static_auth_secret }}
+realm=turn.{{ hostname_matrix }}
+cert=/matrix-config/{{ hostname_matrix }}.tls.crt
+pkey=/matrix-config/{{ hostname_matrix }}.tls.key
+dh-file=/matrix-config/{{ hostname_matrix }}.tls.dh
+cipher-list="HIGH"
+min-port={{ matrix_coturn_turn_udp_min_port }}
+max-port={{ matrix_coturn_turn_udp_max_port }}
+external-ip={{ matrix_coturn_turn_external_ip_address }}
+log-file=stdout
+pidfile=/var/tmp/turnserver.pid
+userdb=/var/tmp/turnserver.db
+no-cli

roles/matrix-server/templates/systemd/matrix-coturn.service.j2

@@ -0,0 +1,25 @@
+[Unit]
+Description=Matrix Coturn server
+After=docker.service
+Requires=docker.service
+
+[Service]
+Type=simple
+ExecStartPre=-/usr/bin/docker kill matrix-coturn
+ExecStartPre=-/usr/bin/docker rm matrix-coturn
+ExecStart=/usr/bin/docker run --rm --name matrix-coturn \
+			--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
+			-p 3478:3478 \
+			-p 3478:3478/udp \
+			-p {{ matrix_coturn_turn_udp_min_port }}-{{ matrix_coturn_turn_udp_max_port }}:{{ matrix_coturn_turn_udp_min_port }}-{{ matrix_coturn_turn_udp_max_port }}/udp \
+			-v {{ matrix_synapse_config_dir_path }}:/matrix-config:ro \
+			-v {{ matrix_coturn_config_path }}:/turnserver.conf:ro \
+			{{ docker_coturn_image }} \
+			-c /turnserver.conf
+ExecStop=-/usr/bin/docker kill matrix-coturn
+ExecStop=-/usr/bin/docker rm matrix-coturn
+Restart=always
+RestartSec=30
+
+[Install]
+WantedBy=multi-user.target

roles/matrix-server/templates/systemd/matrix-synapse.service.j2

@@ -10,6 +10,8 @@ After=matrix-postgres.service
 After=matrix-goofys.service
 Requires=matrix-goofys.service
 {% endif %}
+After=matrix-coturn.service
+Requires=matrix-coturn.service
 
 [Service]
 Type=simple
@@ -29,12 +31,10 @@ ExecStart=/usr/bin/docker run --rm --name matrix-synapse \
 			{% if not matrix_nginx_proxy_enabled %}
 			-p 127.0.0.1:8008:8008 \
 			{% endif %}
-			-p 3478:3478 \
-			-p 3478:3478/udp \
-			-p {{ matrix_coturn_turn_udp_min_port }}-{{ matrix_coturn_turn_udp_max_port }}:{{ matrix_coturn_turn_udp_min_port }}-{{ matrix_coturn_turn_udp_max_port }}/udp \
 			-v {{ matrix_synapse_config_dir_path }}:/data \
 			-v {{ matrix_synapse_run_path }}:/matrix-run \
 			-v {{ matrix_synapse_storage_path }}:/matrix-storage:slave \
+			-e SYNAPSE_CONFIG_PATH=/data/homeserver.yaml \
 			{{ docker_matrix_image }}
 ExecStop=-/usr/bin/docker kill matrix-synapse
 ExecStop=-/usr/bin/docker rm matrix-synapse