Auto-rebuild and auto-update dockerimage

[aleksandr-kotlyar]

What

When Dockerfile or requirements.txt (Pipfile, etc.) modifies - need to rebuild, test new image and replace previous one with keeping history. How can this be done?

ToDo

1. Trigger docker build job on changes
   1. Dockerfile;
   2. CI file with "docker build job";
   3. Requirements.txt / Pipfile / etc. whatever with dependencies
2. Run tests on new docker image.
3. If tests passed - replace docker image in registry or ci files, but keep the previous version of image.