Use a bot to update Dockerfile froms

[garethahealy]

re: 58e71a0

since i raised the above, it got my thinking. could we use a bot to do this? looks like dependabot supports docker:

• https://dependabot.com/docker/

@pabrahamsson ; thoughts around general idea?

[pabrahamsson]

@etsauer @sabre1041 am I good to add dependabot to the redhat-cop org?

[etsauer]

@pabrahamsson @garethahealy I like it.

[pabrahamsson]

First try and I think we might need some additional tweaking
#295

[stale]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

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