This will store the temporary files in the current working directory, the -v flag in Docker is the -B flag in Singularity, which means to mount (~connect) your current working directory inside the container as /busco_wd/
You will have a new folder in your working directory called busco_downloads which contains the models from, in this case, the viridiplantae dataset.
On a HPC you will need to use singularity. Docker requires root privileges to run which I’ll guess you don’t have.
Once you have singularity working try the following command: