setup: add support for XRootD

[tiborsimko]

For some LHCb workflows, it is necessary to have XRootD support in the workflow engine process itself.

Example:

• https://snakemake.readthedocs.io/en/stable/snakefiles/remote_files.html#xrootd

We should add all the necessary system and Python libraries into the component image so that Snakemake would see them.