add datalad_container to install instruction deps

[asmacdo]

(reproman-sandbox) [f006rq8@x01 ds000003-qc]$ cat run.sh 
reproman run -r discovery \
   --sub slurm --orc datalad-no-remote \
   --jp "container=containers/bids-mriqc" --bp subj=02,13 --follow \
   --input 'sourcedata/sub-{p[subj]}' \
   --output . \
   '{inputs}' . participant group -w workdir --participant_label '{p[subj]}'

023-02-21 12:14:59,884 [ERROR  ] datalad_container of version >= 0.4.0 is missing. [external_versions.py:check:295] (MissingExternalDependency)