CI dag test

[WardDeb]

Using -q / --quiet on top of a dryrun would make parsing the proposed number of rules more straight forward and easier to replicate with changing versions of snakemake. (which would be a preferred metric over a linecount if I understand correctly)

[katsikora]

It would be good to test this in parallel to the line count, and deprecate over time, I think.
Also, perhaps snakemake's unit tests could be useful, and some sort of checks on the wildcards.