Make a version toggle

[castrojo]

Similarly to ujust devmode and ujust toggle-nvk, let's make one that shows the branches for whatever image you're on and let's the user select:

ujust toggle-release
Current release: bluefin-dx:latest
Options to rebase to:
`latest` - Currently F39
`gts` - Currently F38
`39` - Lock device to F39
`38` - Lock device to F38

And then use the same charm selector.

[castrojo]

Probably should be a new issue but it would also be cool if you just had the last 5 days of images by date in there too so you could just quickly rewind on the spot if you need to.

[bsherman]

I'm a bit confused by this idea.

Haven't we rejected similar "switch version" concepts in the past?

Also, "branches" ... are you referring to image tags or git branches?
I'm thinking image tags... so some github GHCR API queries?

[castrojo]

Image tags is what we should do so we don't have to keep track of the versions in here, so probably "skopeoing" the right version and tags?

[bsherman]

Image tags is what we should do so we don't have to keep track of the versions in here, so probably "skopeoing" the right version and tags?

hmm... skopeo inspects image metadata once you already have a URL for one but doesn't let you query the registry. I think that's required to get a dynamic list.

[m2Giles]

If we do something like this, it should be a move forward. You can move from gts -> latest. Or latest -> beta. Or move from the same image version to the convenience tag.

Going backwards has possibilities of breaking and isn't a supported feature upstream.