bbb-webhooks cannot be installed

[antobinary]

Describe the bug

Cannot install BBB package bbb-webhooks due to npm ERR! unsafe-perm is not a valid npm option. Initial investigation points to npm version troubles. I find unsafe-perm in npm's docs https://docs.npmjs.com/cli/v6/using-npm/config?v=true#unsafe-perm on versions up to 7, but not after. Right now BBB 2.5, 2.6 use npm 8, and we're transitioning to version 9+ for BBB 2.7.

It is part of the after-install script:
npm config set unsafe-perm true
https://github.com/bigbluebutton/bigbluebutton/blob/v2.6.x-release/build/packages-template/bbb-webhooks/after-install.sh#L24

Console output

root@droplet-8443:/usr/local/bigbluebutton# apt install bbb-webhooks 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  bbb-webhooks
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 5386 kB of archives.
After this operation, 19.1 MB of additional disk space will be used.
Get:1 https://ubuntu.bigbluebutton.org/focal-27-dev bigbluebutton-focal/main amd64 bbb-webhooks amd64 1:2.7-3 [5386 kB]
Fetched 5386 kB in 0s (29.1 MB/s)     
Selecting previously unselected package bbb-webhooks.
(Reading database ... 234471 files and directories currently installed.)
Preparing to unpack .../bbb-webhooks_1%3a2.7-3_amd64.deb ...
Unpacking bbb-webhooks (1:2.7-3) ...
Setting up bbb-webhooks (1:2.7-3) ...
npm ERR! `unsafe-perm` is not a valid npm option

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2023-06-09T10_07_19_200Z-debug-0.log
dpkg: error processing package bbb-webhooks (--configure):
 installed bbb-webhooks package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 bbb-webhooks
E: Sub-process /usr/bin/dpkg returned an error code (1)

Additional context
Also reported in https://groups.google.com/g/bigbluebutton-dev/c/11RlUkG0yh8/m/PA9s6cg2AgAJ

A fix will have to be propagated to BBB 2.5 too.