Allow building for a list of accelerators in a single build #1044

Job	Run time
eessi_container_script (run)	2m 26s
eessi_container_script (shell)	2m 21s
eessi_container_script (resume)	2m 16s
eessi_container_script (unionfs)	2m 13s
eessi_container_script (help)	1m 30s
eessi_container_script (no_cvmfs_mounts)	2m 27s
eessi_container_script (container)	2m 46s
eessi_container_script (exec)	2m 20s
eessi_container_script (listrepos_custom)	1m 53s
eessi_container_script (listrepos_default)	1m 50s
	22m 2s

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