services: add Synapse

Synapse is the Matrix server software.

This needs some manual setup, launching `docker-compose exec synapse sh`
followed by `register_new_matrix_user -c /data/homeserver.yaml
https://matrix.belanyi.fr/` inside the container.

docker-compose.yml

@@ -326,3 +326,14 @@ services:
     expose:
       - 5000
     user: 1000:1000
+
+  synapse:
+    image: matrixdotorg/synapse
+    restart: unless-stopped
+    container_name: synapse
+    env_file:
+      - ./matrix/matrix.env
+    volumes:
+      - ./matrix:/data
+    ports:
+      - 8008:8008

letsencrypt/nginx/proxy-confs/matrix.subdomain.conf

@@ -0,0 +1,39 @@
+# make sure that your dns has a cname set for matrix and that your matrix container is not using a base url
+
+server {
+    listen 443 ssl;
+    listen [::]:443 ssl;
+
+    server_name matrix.belanyi.fr;
+
+    include /config/nginx/ssl.conf;
+
+    location /_matrix {
+        include /config/nginx/proxy.conf;
+
+        resolver 127.0.0.11 valid=30s;
+
+        set $upstream_app synapse;
+        set $upstream_port 8008;
+        set $upstream_proto http;
+        proxy_pass $upstream_proto://$upstream_app:$upstream_port;
+
+        # Nginx by default only allows file uploads up to 1M in size
+        # Increase client_max_body_size to match max_upload_size defined in homeserver.yaml
+        client_max_body_size 10M;
+    }
+}
+
+server {
+    listen 443 ssl;
+    listen [::]:443 ssl;
+
+    server_name belanyi.fr;
+
+    include /config/nginx/ssl.conf;
+
+    location /.well-known/matrix/server {
+        default_type application/json;
+        return 200 '{"m.server": "matrix.belanyi.fr:443"}';
+    }
+}

matrix/matrix.env

@@ -0,0 +1,5 @@
+SYNAPSE_SERVER_NAME=belanyi.fr
+UID=1000
+GID=1000
+TZ=FR
+SYNAPSE_REPORT_STATS=yes