Add task to unpack tar.gz file

concourse/tasks/unpack.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+set -e
+workdir=$(pwd)
+in=${workdir}/in
+out=${workdir}/out
+cd $out
+tar xvf ${in}/*.tar.gz 

concourse/tasks/unpack.yml

@@ -0,0 +1,12 @@
+platform: linux
+image_resource:
+  type: docker-image
+  source:
+    repository: kdvolder/sts4-build-env
+run:
+  path: sts4/concourse/tasks/unpack.sh
+inputs:
+- name: sts4
+- name: in
+outputs:
+- name: out