I don’t think those permissions are wrong. But that’s a very old datestamp. I would have expected these things to come in the shipped containers so it seems possible you are very much behind in updates, somehow.
This is what I see (from outside the container)
/var/discourse# docker image ls
REPOSITORY TAG IMAGE ID CREATED SIZE
local_discourse/app latest 1727731a0700 4 months ago 3.19GB
discourse/base 2.0.20220720-0049 13ff18ca36a6 4 months ago 2.65GB