If i create a job which builds an image let's say:
image:tag

lets say i wan't now push the image to my personal registries:
registry:5000 and registry2:5000

to achieve that i would now need to add
registry:5000/image:tag in the build step to push the image to registry:5000
and if i wan't to push it to registry2:5000 i have to create a image registry2:5000/image:tag first.

It would be nice if there would be the option to leave the
Registry field in the push step empty and only fill the Registry Server Addresses field.

This would than result in a setup like this:

Step 1: Build the image
Result: image named image:tag

Step 2: Push the image
Name of the image to push (repository/image) : image
Tag: tag
Registry: null or empty
Registry Server Addresses: registry:5000

Step 3: Push the image again
Name of the image to push (repository/image) : image
Tag: tag
Registry: null or empty
Registry Server Addresses: registry2:5000