SSH over IPv4 is currently unavailable. SSH can be used with IPv6 or Tor.
Older container registry paths (gitlab.fancy.org.uk:5005) are also now IPv6 only. Use registry.fancy.org.uk instead.
Releases are based on Git tags and mark specific points in a project's development history. They can contain information about the type of changes and can also deliver binaries, like compiled versions of your software.