Add synapse role

For all the hipster kids.

roles/synapse/templates/nginx.conf.j2

@@ -0,0 +1,20 @@
+server {
+    server_name {{ dns_name }};
+
+    listen [::]:443 ssl ipv6only=off;
+    ssl_certificate /etc/letsencrypt/live/{{ dns_name }}/fullchain.pem;
+    ssl_certificate_key /etc/letsencrypt/live/{{ dns_name }}/privkey.pem;
+
+    location ~ ^(/_matrix|/_synapse/client) {
+        proxy_pass http://unix:/var/lib/synapse/socket/main.sock;
+        proxy_set_header X-Forwarded-For $remote_addr;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header Host $host;
+
+        # match max_upload_size defined in homeserver.yaml
+        client_max_body_size 50M;
+
+        # Synapse responses may be chunked, which is an HTTP/1.1 feature.
+        proxy_http_version 1.1;
+    }
+}