Make `EESSI-extend` support accelerator installations #106

Job	Run time
eessi_container_script (listrepos_custom)	1m 55s
eessi_container_script (help)	2m 9s
eessi_container_script (shell)	2m 48s
eessi_container_script (container)	2m 44s
eessi_container_script (unionfs)	3m 14s
eessi_container_script (listrepos_default)	3m 4s
eessi_container_script (run)	3m 25s
eessi_container_script (resume)	2m 40s
	21m 59s

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