fix: keep the terminal WebSocket open past nginx's 60s default (#1588)

docker/nginx-https.conf

@@ -425,6 +425,16 @@ http {
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             proxy_set_header X-Forwarded-Proto $proxy_x_forwarded_proto;
+            # A terminal is quiet most of the time - waiting on a prompt, reading
+            # output, running something long. Every console plugin dials this route
+            # (terminal, serial, remote desktop), and nginx's default
+            # proxy_read_timeout of 60s closed the socket about a minute into any
+            # pause, which reaches the user as the SSH server disconnecting. The
+            # plugin WebSocket routes below already ask for 86400s; this is the same
+            # class of socket, so it asks for the same.
+            proxy_read_timeout 86400s;
+            proxy_send_timeout 86400s;
+            proxy_buffering off;
         }
 
         location /host/ {