use as default theme if not exist #974

Job	Run time
Build Matomo NGINX / build	14s
Build Databox Indexer / build	1m 14s
Build Dashboard / build	16s
Build Keycloak / build	50s
Build Matomo PHP / build	18s
Build nginx-cache-purge / build	18s
Build nginx-fpm-base / build	18s
Build nodejs-base / build	20s
Build php-fpm-base / build	15s
Build Report API / build	22s
Build Configurator / build	15s
Build Expose API / build	1m 52s
Build Uploader API / build	1m 23s
Build Notify API / build	1m 18s
Build Databox API / build	1m 45s
Build Databox Client / build	2m 52s
Build Uploader Client / build	1m 57s
Build Expose Client / build	2m 31s
Setup stack	7m 24s
	25m 42s

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