Teams webhook returns 404 when running botpress on a (not empty) root path

Description

When running botpress on path (e.g. EXTERNAL_URL=http://localhost:3000/some_path), messaging endpoint for teams fails with 404 (e.g. POST http://localhost:3000/some_path/api/v1/messaging/webhooks/<bot-id>/teams)

To reproduce

Run botpress with a not empty root path:

docker run --rm --name botpress --publish 3000:3000 --env "EXTERNAL_URL=http://localhost:3000/botpress" botpress/server:v12_31_0

Navigate to http://localhost:3000/botpress and create an admin

Create an empty bot named empty_bot, and configure teams channel:

...
 "messaging": {
   "channels": {
     "teams": {
       "enabled": true,
       "appId": "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa",
       "appPassword": "01234567890.1234567890.123456789.abcde.."
     }
   }
 }

Try to post to http://localhost:3000/botpress/api/v1/messaging/webhooks/empty_bot/teams

curl -vvv --request POST http://localhost:3000/botpress/api/v1/messaging/webhooks/empty_bot/teams
*   Trying 127.0.0.1:3000...
* Connected to localhost (127.0.0.1) port 3000 (#0)
> POST /botpress/api/v1/messaging/webhooks/empty_bot/teams HTTP/1.1
> Host: localhost:3000
> User-Agent: curl/7.88.1
> Accept: */*
> 
< HTTP/1.1 404 Not Found
< X-Powered-By: Express
< content-security-policy: default-src 'none'
< x-content-type-options: nosniff
< content-type: text/html; charset=utf-8
< content-length: 173
< date: Fri, 06 Oct 2023 01:20:59 GMT
< connection: close
< Vary: Accept-Encoding
< 
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Error</title>
</head>
<body>
<pre>Cannot POST /botpress/webhooks/empty_bot/teams</pre>
</body>
</html>
* Closing connection 0

Expected behavior

Botpress should be able to resolve the given URL (in this case, should return 400 BAD REQUEST). To ilustrate, repeat the example but with EXTERNAL_URL=http://localhost:3000 and executing a POST to http://localhost:3000/api/v1/messaging/webhooks/empty_bot/teams

Screenshots n/a

Environment (please complete the following information):

OS: Linux (docker)
Browser: n/a
Browser Version: n/a
Botpress Version: 12.30.9 to 12.31.0
NodeJS: n/a

Additional context n/a

botpress / v12

Teams webhook returns 404 when running botpress on a (not empty) root path #1777