salmon: add singularity files

src/singularity_modules/salmon/0.8.2/build.sh

+#/bin/sh
+sudo singularity build --force bin/salmon:0.8.2.sif src/singularity_modules/salmon/0.8.2/salmon.def
+singularity sign bin/salmon:0.8.2.sif

src/singularity_modules/salmon/0.8.2/salmon.def

+Bootstrap: docker
+From: ubuntu:18.04
+
+%labels
+MAINTAINER Laurent Modolo
+
+%post
+SALMON_VERSION=0.8.2
+PACKAGES="curl \
+ca-certificates"
+
+apt-get update && \
+apt-get install -y --no-install-recommends ${PACKAGES} && \
+apt-get clean
+
+curl -k -L  https://github.com/COMBINE-lab/salmon/releases/download/v${SALMON_VERSION}/Salmon-${SALMON_VERSION}_linux_x86_64.tar.gz -o Salmon-${SALMON_VERSION}_linux_x86_64.tar.gz && \
+tar xzf Salmon-${SALMON_VERSION}_linux_x86_64.tar.gz && \
+mv Salmon-${SALMON_VERSION}_linux_x86_64/bin/* /usr/bin/ && \
+rm -Rf Salmon-${SALMON_VERSION}*
+
+%environment
+export SALMON_VERSION=0.8.2
+
+%runscript
+exec /bin/bash "$@"