Make `EESSI-extend` support accelerator installations #101

Job	Run time
eessi_container_script (help)	1m 24s
eessi_container_script (run)	2m 22s
eessi_container_script (resume)	2m 22s
eessi_container_script (container)	2m 38s
eessi_container_script (unionfs)	2m 12s
eessi_container_script (shell)	2m 0s
eessi_container_script (listrepos_custom)	1m 21s
eessi_container_script (listrepos_default)	1m 24s
	15m 43s

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