Make `EESSI-extend` support accelerator installations #111

Job	Run time
eessi_container_script (help)	1m 18s
eessi_container_script (listrepos_default)	1m 20s
eessi_container_script (resume)	2m 8s
eessi_container_script (container)	2m 2s
eessi_container_script (run)	2m 16s
eessi_container_script (listrepos_custom)	1m 29s
eessi_container_script (unionfs)	3m 19s
eessi_container_script (shell)	2m 0s
	15m 52s

Provide feedback