Define .image files for a single definition of images

[ekohl]

Today we have multiple files that all write down the image, but podman supports defining .image files. That means we can have both foreman.container and dynflow-sidekiq-%i refer to a foreman.image. In this .image file we can define the the exact image to be used in a single place.

This can also be interesting for disconnected installations. The documentation states you can use:

[Image]
Image=docker-archive:/tmp/archive-file.tar
ImageTag=quay.io/podman/stable:latest

This could save writing custom setup scripts and simply deploy a drop in file.