Why not simply use the new Jitsi Package I created and published?
It can be found on Community Package Hub as a signed Package: https://www.cphub.net/?p=jitsimeet (just add this package source to get updates)
Sorce code is on github in examples/synology directory here https://github.com/TosoBoso/docker-jitsi-meet/tree/synology/examples/synology which is forked from jitsi.
I already raised a pull request. but currently it is not merged in and kept separate.
Check it out, it just works, installs and orchestrates all via UI, nice features incl. no need to ssh for commands as it has an admin-gui.
An important feature: jitsi needs to know its public IP which has to be set as DOCKER_IP_ADRESS in the env and this package automates this at startup. So if you router changes IP each night just schedule a package restart each morning
PS: by definition it will only work on x64 NAS, the + models supporting Docker