New stable versions aren't created without a reinstall

[GVodyanov]

Following the standard documentation and creating a worktree results in a setup where "stable31.local" is not accessible.

There don't seem to be any differences from the logs produced by turning on stable30, so there is no logged error I can see.

log.txt

How to reproduce:

• Setup nextcloud-docker-dev
• Have a new stable version come out
• Clone the new stable version and set up a worktree
• Run docker compose up stable[x]
• stable[x].local is not accessible on localhost. It only becomes accessible by doing a complete reinstall with bootstrap.sh

[GVodyanov]

My bad, recloning the whole repository and running bootstrap.sh solves this issue, however I think it would make sense to add that to the documentation.