Added sample workload script to be used on treecript demos.

The script has as workload the fetch of a couple of archives available
in a site (two archives of linux kernel sources), one of them packed
with tar + gz and the other with tar + xz , interleaved all the tasks
with `sleep 2` calls in order to offer a clear separation between
the tasks.

Author: jmfernandez

sample-work-to-measure/download-and-test-linux-6.6.bash

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+workdir="$(mktemp -d --tmpdir treecript_demo.XXXXXXXXXX)"
+
+cleanup() {
+	set +e
+	# This is needed in order to avoid
+	# potential "permission denied" messages
+	chmod -R u+w "${workdir}"
+	rm -rf "${workdir}"
+}
+
+trap cleanup EXIT
+
+file1=https://www.kernel.org/pub/linux/kernel/v6.x/linux-6.6.114.tar.gz
+file2=https://www.kernel.org/pub/linux/kernel/v6.x/linux-6.6.114.tar.xz
+
+echo Fetching first file "${file1}"
+wget -nv -P "${workdir}" "${file1}"
+echo Sleeping 2 seconds
+sleep 2
+echo Fetching second file "${file2}"
+wget -nv -P "${workdir}" "${file2}"
+echo Sleeping 2 more seconds
+sleep 2
+echo Testing integrity of first file
+gunzip -t "${workdir}"/*.gz
+tar tf "${workdir}"/*.gz
+echo Sleeping the last 2 seconds
+sleep 2
+echo Testing integrity of second file
+xz -T -t "${workdir}"/*.xz
+tar tf "${workdir}"/*.xz