Build a phar release

[ralflang]

Facilitate CI use cases, discourage users from installing it into the software stack they want to install/test/release. They easily end up with dependencies they don't need.

[ralflang]

See https://www.ralf-lang.de/2022/08/24/phar-out-horde-components-in-one-file/ and https://horde-satis.maintaina.com/horde-components - The artifact exists but it should really come from a CI pipeline.