Add explicit image push to cache preparation (#21229)
Add explicit image push to cache preparation (#21229)

When BUILDKIT cache is prepared, you cannot (yet) at the same time
to "load" the image to local docker engine and "push" it to the
registry. You need to push it separately.

This change adds separate "push" step when buildx cache is prepared.
danielvdende/incubator-airflow,nathanielvarona/airflow,cfei18/incubator-airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,bolkedebruin/airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,apache/airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,nathanielvarona/airflow,apache/airflow,lyft/incubator-airflow,bolkedebruin/airflow,lyft/incubator-airflow,nathanielvarona/airflow,cfei18/incubator-airflow,nathanielvarona/airflow,apache/airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,bolkedebruin/airflow,Acehaidrey/incubator-airflow,lyft/incubator-airflow,danielvdende/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,apache/airflow,lyft/incubator-airflow,Acehaidrey/incubator-airflow,bolkedebruin/airflow,nathanielvarona/airflow,apache/airflow,apache/airflow