OZG-6989 read user api pass from env

alfa-client/apps/alfa-e2e/docker-compose.yml

@@ -154,9 +154,9 @@ services:
     environment:
       - KEYCLOAK_URL=https://sso.dev.by.ozg-cloud.de
       - OZGCLOUD_KEYCLOAK_API_CLIENT=alfa
-      - OZGCLOUD_KEYCLOAK_API_PASSWORD= 
       - OZGCLOUD_KEYCLOAK_API_REALM=${KEYCLOAK_REALM:-by-e2e-tests-local-dev}
       - OZGCLOUD_KEYCLOAK_API_USER=usermanagerapiuser
+      - OZGCLOUD_KEYCLOAK_API_PASSWORD=${OZGCLOUD_KEYCLOAK_API_PASSWORD:-}
       - OZGCLOUD_USER_MANAGER_URL=http://localhost:9092
       - OZGCLOUD_USERSYNC_PERIOD=disabled
       - OZGCLOUD_USERSYNC_ONSTART=false