make occ upgrade call part of the container start script #88

Job	Run time
Build App Containers (indico) / Build indico	2m 18s
Build App Containers (etherpad) / Build etherpad	48s
Build App Containers (limesurvey) / Build limesurvey	36s
Build App Containers (minecraft) / Build minecraft	15s
Build App Containers (nextcloud) / Build nextcloud	1m 37s
Build App Containers (sogo) / Build sogo	2m 54s
	8m 28s

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