Features
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- Allow to build and push docker images to the remote image registries.
The requirement for allowing Kaniko (the underlying tool) to push such images - it should be authenticated.
The registry authention data structure should be in the following form:
`{"auths": {"<registry URI>": {"auth": "<base64 encoded '<username>:<password>' string"}}}`
(tested with the `https://index.docker.io/v1/` - public DockerHub registry)
`neuro-extras config build-registry-auth` command might become handy in this case.
To attach the target registry AUTH data into the builder job, one might save it as the platform secret and mount it into the builder job.
Mounting of the secret could be done either as the ENV variable with the name prefixed by `NE_REGISTRY_AUTH` or as the secret file.
In the latter case, the ENV variable should also be added with the mentioned above prefix and pointing to the corresponding file. ([328](https://github.com/neuromation/neuro-extras/issues/328))