bind /scratch to pollux profile in nextflow.config

src/nextflow.config

@@ -76,7 +76,7 @@ profiles {
   pollux {
       singularity.enabled = true
       singularity.cacheDir = "./bin/"
-      singularity.runOptions = "--bind /data,/home"
+      singularity.runOptions = "--bind /data,/home,/scratch"
       process {
         errorStrategy = 'finish'
         memory = '256GB'