Error reading plugin file

[viadezo1er]

Describe the bug
Failure to read the plugin file when launched with docker compose:
etherpad_go | Error reading plugin file

To Reproduce

1. docker compose up using docker-compose.yml from the repo (main branch, or after my PR fix: updated postgre volume mount point path #124, same thing).
   It starts normally, the pad works in the browser:
   etherpad_go | 2026-02-07T05:22:51.307Z INFO server/server.go:159 Starting Web UI on 0.0.0.0:9001
2. Wait
3. This message appears and is repeated:
   etherpad_go | Error reading plugin file

Expected behavior
Plugins being loaded from settings.json and messages like the ones from etherpad-lite:
app-1 | [2026-02-07T05:44:13.859] [INFO] settings - settings loaded from: /opt/etherpad-lite/settings.json

Server (please complete the following information):

• Etherpad version: 0.0.4, commit adc772f
• OS: NixOS 25.11 x86_64
• docker version
  • Client:
    Version: 28.5.2
    API version: 1.51
    Go version: go1.25.5
    Git commit: v28.5.2
    Built: Thu Jan 1 00:00:00 1970
    OS/Arch: linux/amd64
    Context: default
  • Server:
    Engine:
    Version: 28.5.2
    API version: 1.51 (minimum version 1.24)
    Go version: go1.25.5
    Git commit: v28.5.2
    Built: Tue Jan 1 00:00:00 1980
    OS/Arch: linux/amd64
    Experimental: false
    containerd:
    Version: v2.2.1
    GitCommit: refs/tags/v2.2.1
    runc:
    Version: 1.3.3
    GitCommit:
    docker-init:
    Version: 0.19.0
    GitCommit:
    rootlesskit:
    Version: 2.3.5
    ApiVersion: 1.1.1
    NetworkDriver: slirp4netns
    PortDriver: builtin
    StateDir: /run/user/1000/dockerd-rootless
    slirp4netns:
    Version: 1.3.3
    GitCommit: 944fa94090e1fd1312232cbc0e6b43585553d824
• Is the server free of plugins: yes since it's ghcr.io/ether/etherpad-go

Additional context
Happens without settings.json, with empty settings.json, with settings.json being this:

{
  "plugins": {
    "ep_align": { "enabled": true }
  }
}

It might simply be because settings.json isn't seen by the container?

I'm not sure what ep_align is supposed to do, but I didn't see any difference with
ETHERPAD_PLUGINS_EP_ALIGN_ENABLED=false and ETHERPAD_PLUGINS_EP_ALIGN_ENABLED=true.