MetaCentrum-Workernode-v-Singularity.md

+```
+export SINGULARITY_CACHEDIR=$SCRATCHDIR
+export SINGULARITY_LOCALCACHEDIR=$SCRATCHDIR
+export SINGULARITY_TMPDIR=$SCRATCHDIR
+singularity build --sandbox $SCRATCHDIR/workernode docker://gitlab-registry.cesnet.cz/702/public/debian-workernode-docker
+```
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