use shebang in post-deploy script, to ensure using bash (see snakemak…

…e/snakemake#1841 for details of respective snakemake change)

workflow/envs/neo_fox_deps.post-deploy.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 set -euo pipefail
 
 # set all the necessary conda paths and