Make Docker Images list draggable (reorder via drag & drop)

[Hampap]

Description
Currently, Docker Images in the Egg configuration are displayed as a static list where the order cannot be easily changed. Since the first image in the list is used as the default, managing the order is important.

It would be very helpful to allow administrators to reorder Docker Images using drag & drop.

Proposed Solution
Enable drag & drop functionality for the Docker Images list so users can easily reorder items. The updated order should be saved automatically (or on save) and reflected in the default image selection.

Expected Behavior

User can drag and drop Docker Image rows to change their order
The first item in the list becomes the default image
Order is preserved after saving

Use Case
When managing multiple Java versions (e.g., Java 8, 11, 17, 21, 25), admins may want to quickly change which version is default without deleting and re-adding entries.

Alternative (optional)
If drag & drop is not possible, simple up/down arrows for reordering would also solve the issue.

[mristau]

it would probably always be overriden by the default order when updating the egg

[Hampap]

That makes sense for updates, but this feature would still be useful for manual management.

Right now, if I want to change the default Docker image, I have to delete and re-add entries just to change the order, which is not very convenient.

Drag & drop (or even simple up/down controls) would make it much easier to manage the order locally between updates.

Even if the order gets overridden on update, it would still significantly improve usability in day-to-day administration.

[notAreYouScared]

This was done and is in the latest beta, #2316