Allow multiple instances at the same time in the same network stack

[Gylesie]

Is this a new feature request?

• [X] I have searched the existing issues

Wanted change

Hello! I would like to run multiple instances of apps built on top of this image. I. e. I want to run multiple kasmvnc based containers in the same network stack without their ports coliding. This is the error that the second instance outputs after being started:

Error: listen EADDRINUSE: address already in use :::6900
    at Server.setupListenHandle [as _listen2] (node:net:1817:16)
    at listenInCluster (node:net:1865:12)
    at Server.listen (node:net:1953:7)
    at Object.<anonymous> (/kclient/index.js:184:6)
    at Module._compile (node:internal/modules/cjs/loader:1256:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1310:10)
    at Module.load (node:internal/modules/cjs/loader:1119:32)
    at Module._load (node:internal/modules/cjs/loader:960:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:86:12)
    at node:internal/main/run_main_module:23:47
Emitted 'error' event on Server instance at:
    at emitErrorNT (node:net:1844:8)
    at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
  code: 'EADDRINUSE',
  errno: -98,
  syscall: 'listen',
  address: '::',
  port: 6900
}

Reason for change

A user can run multiple instances of for example browser in the same network stack.

Proposed code change

No response

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