Review CI in domestic repositories

[argenos]

Travis is failing to catch some of the failing builds. After the refactoring, it makes sense to take a look at how the Travis and Docker setups were made, and improve the workflow.

The refactoring helped to reduce the build time for about 10 minutes, but there are still improvements that can be made:

• on deployment, the docker image is being built from scratch
• publishing images for long-term branches and building against them

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.