Collect the release images on docker hub for the Exasol releases

[tkilias]

Situation:

• in our documentation we said that you should download the standard container from the bucketfs, import it to docker and compile your package within this container
• In future we want to provide the container of each Exasol Version as docker image at docker hub

Acceptance Criteria

• we need to upload the image during a release to docker hub with the right Exasol Version attached
• we need an own docker hub repository, such the user can easily browse and search for the Exasol version
  Open Questions:
• How do we do the release?
  • a normal release releases all flavors, so if the tag would be an exasol version it is confusing
  • could we use special tags for exasol standard container releases? Which only releases a specific flavor for a specific version.

Depends

Depends on:
exasol/script-languages-container-tool#86
exasol/integration-test-docker-environment#131

Future

#396