use pigz in filtlong container, don't rely on hpc node

[kapsakcj]

Just ran into an issue where pigz was not present on the HPC node assigned to the filtlong job. I've asked SCBS to install it across the cluster, but it would be safer to use pigz that's included in the container.

Since filtlong requires the use of redirect filtlong [options] reads.fastq.gz | pigz >filtered-reads.fastq.gz, it will require some shell magic to pass the bash variables into the singularity container at runtime.

[kapsakcj]

or use the module? That would be the easier route.... 🤓