ANN: Skosmos 2.18.1 with Docker fix

[Osma Suominen]

Skosmos 2.18.1 has been released!

https://github.com/NatLibFi/Skosmos/releases/tag/v2.18.1

This is a patch release that fixes problems building the Docker container for Skosmos 2. In the 2.18.0 release, support for PHP 7.4 was dropped, but the Dockerfile in 2.18.0 was still using PHP 7.4, so it didn't work. In this release, the Docker base image has been upgraded to Ubuntu 22.04 which includes PHP 8.1, making it work again. Credit to @matthew-morris-cessda for quickly reporting the issue after the 2.18.0 release.

Bug fixes

• #1678/#1680 Skosmos 2 Docker: upgrade to Ubuntu 22.04 base image and PHP 8.1

See the upgrade instructions in the wiki for information about upgrading from earlier versions.