improve keycloak migration #926

Job	Run time
Build nginx-fpm-base / build	12s
Build nodejs-base / build	14s
Build Dashboard / build	24s
Build Databox Indexer / build	23s
Build Keycloak / build	16s
Build Matomo NGINX / build	23s
Build php-fpm-base / build	13s
Build Matomo PHP / build	23s
Build nginx-cache-purge / build	14s
Build Report API / build	21s
Build Databox Client / build	15s
Build Expose Client / build	14s
Build Uploader Client / build	17s
Build Configurator / build	24s
Build Databox API / build	45s
Build Notify API / build	24s
Build Expose API / build	39s
Build Uploader API / build	25s
Setup stack	6m 58s
	13m 24s

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