[Docker] joynr-gcd-db uses joynr-base/init.sql
[Docker] joynr-gcd-db uses joynr-base/init.sql

* Previous find command returned 2 results in case both
  joynr-base and joynr-base-alpine are present.

bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr