Can't deploy cryptpad on a different machine than reverse proxy

[Enteee]

Description

The web socket port in the 5.4 release always binds to localhost.

cryptpad/server.js

Line 84 in a3772cf

Env.httpServer.listen(Env.websocketPort, 'localhost', w(function () {

Therefore 5.4 can only be deployed if nginx runs on the same machine.

Steps to reproduce

1. deploy crypgpad on different machine than nginx
2. run /checkup

Relevant logs

nginx error log:

2023/08/18 22:33:31 [error] 17#17: *1837 connect() failed (111: Connection refused) while connecting to upstream, client: ********, server: ****, request: "GET /cryptpad_websock
et HTTP/1.1", upstream: "http://***:3003/cryptpad_websocket", host: "***"

[Enteee]

maybe related to: #1185

[Enteee]

this commit Enteee@b58149b fixes the issue for me

[davidbenque]

Related to #1182 which is fixed and will be released soon