Prevent different images with identical url

[majst01]

If this happens, in my opinion, it is a mistake. I would like to prevent this.

@mwindower @Gerrit91 @droid42 @mwennrich WDYT ?

[mwindower]

I would say that this scenario is currently okay given that the same machine type is specified for all images that use the same URL: worker or firewall image.

If this is the case I would vote to allow this: having multiple names for the same thing is quite common?

And perhaps we have, in the long term future, an image that can be both, firewall and worker image?

[majst01]

granted the last argument, prevent identical URL per image type. All other cases are mistakes an can lead to very ugly situations. Imagine you have debian-10.0.20200709 but the url points still to debian-10.0.20200331, you won´t be able to detect this.