subread singularity: fix sps and pbs path

src/singularity_modules/subread/1.6.4/build.sh

 #/bin/sh
-sudo singularity build --force bin/subread:1.6.4.img docker://quay.io/biocontainers/subread:1.6.4--h84994c4_1 && \
+sudo singularity build --force bin/subread:1.6.4.img src/singularity_modules/subread/1.6.4/subread.def && \
 singularity sign bin/subread:1.6.4.img

src/singularity_modules/subread/1.6.4/subread.def

+Bootstrap: docker
+From: quay.io/biocontainers/subread:1.6.4--h84994c4_1
+
+%labels
+MAINTAINER Laurent Modolo
+
+%post
+mkdir -p /sps /pbs /scratch
+SUBREF_VERSION=1.6.4
+
+%environment
+export SUBREF_VERSION=1.6.4
+
+%runscript
+exec /bin/bash "$@"