Merge branch 'production' into production_mfabt_20251211

Merge pull request #1384 from ianheggie-oaf/support_ed25519_ssh_keypairs

Added Support ed25519 ssh keypairs as this was a blocker to deployment - Merged to release_candidate branch prior to deploying to production.

I also created a production branch to flag where production was as of Oct 2025 for the last few years.

Deprecate use of organisation api keys

With private repos we can use user's permissions on a repo to easily determine whether they should have read access to the repo. This relationship is a lot more muddy with organisations.

Organisations can own lots of repos but who should have access to those API keys? It's all a bit complicated and frankly not worth the effort. So, it's easier to deprecate organisation API keys.

There are only a very small handful of organisation API keys in use at the moment. So, it's not a big problem really.