Fix pushing image cache
Fix pushing image cache

After converting to `breeze` commands, pushing cache started to fail
as the image tag was used (but for cache we always build and push
using 'latest' images.

danielvdende/incubator-airflow,apache/airflow,lyft/incubator-airflow,Acehaidrey/incubator-airflow,apache/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,lyft/incubator-airflow,apache/airflow,lyft/incubator-airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,lyft/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,apache/airflow,nathanielvarona/airflow,apache/airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow