Running MiXCR through Vidjil

Reported by @meidanis :

The first thing his analysis does is to combine R1 and R2. Shall I do this as a pre-processing step? That was my inclination, but I'm not sure the resulting file from "mixcr align" is a fastq file. Maybe it is written in some other format. How can I continue the analysis then?

Even if I continue the analysis calling mixcr again for the next step, will it produce a .vidjil file? Does it know how to do that?

Finally, is mixcr (the binary, executable) already installed in the containers?

cc @flothoni @mikael-s