Fix tarball naming for CPU-only tarballs #311

Job	Run time
eessi_container_script (shell)	3m 2s
eessi_container_script (unionfs)	2m 59s
eessi_container_script (run)	2m 23s
eessi_container_script (container)	3m 24s
eessi_container_script (listrepos_custom)	1m 31s
eessi_container_script (help)	2m 35s
eessi_container_script (listrepos_default)	2m 16s
eessi_container_script (resume)	3m 15s
	21m 25s

Provide feedback