ensure new container images are downloaded #25
Description
In GitLab by @terceiro on Aug 17, 2021, 15:05 GMT+1:
Now, after a container image is downloaded, it will never be refreshed again. we don't want to hit the network on every run, but we do need to update the image from time to time.
Migrated from GitLab: https://gitlab.com/Linaro/tuxrun/-/issues/25