Admin user password doesn't work

[lupa18]

Describe the bug
I set up 3.6.6 using docker but authentication doesn't worked. First I was upgrading from 3.3.2 but then I delete all and begin from scratch with same result.

To Reproduce
Steps to reproduce the behavior:

1. Copy docker-compose.yml file
2. Create .env file with passwords and other vars
3. Run: docker compose up -d

Expected behavior
When trying to login admin/login then password defined in .env must work

Screenshots
Simple login failed without anything in log file (even having debug enabled):

Server (please complete the following information):

• Etherpad version: 3.3.6
• OS: Ubuntu server
• Node.js version (node --version): default etherpad/etherpad:3.3.6 one
• npm version (npm --version): default etherpad/etherpad:3.3.6 one
• Is the server free of plugins: yes
• Are you using any abstraction IE docker? docker image etherpad/etherpad:3.3.6
• It servers outside using caddy as proxy, it worked before the upgrade from 3.3.2 to 3.3.6

Desktop (please complete the following information):

• OS: linux
• Browser: firefox
• Version 156.0

Additional context
I tried several times removing persistence

Also I checked that .env vars are correctly parsed inside container.

[kanaseprathamesh568-a11y]

Hi @lupa18, I would love to work on this issue. Sir could you please assign it to me?