Portainer fails to edit container on private registries with trailing slash in url

[alekc]

Similar to #1140

I use a private registry for some of my containers, and I noticed recently that on new docker install I was unable to duplicate/edit existing containers, because portainer was giving me an error saying that I needed to create a private registry entry. Which was weird given the fact that portainer has happily created that container couple of minutes earlier.

Turns out that on registry page, registry url had a trailing slash at the end of the url, which permitted me to create new container without issues, but when it came to editing it was failing.

[ghost]

Unable to reproduce this on 1.23.2 as you are prevented from pulling an image from a registry with a trialing slash or start a container from it, you get Failure invalid reference format and cant deploy.

[ghost]

This does highlight though, that we should prevent entry of registries with a trailing slash, or omit it on save

[ghost]

Closing this, as it will be addressed via this enhancement request #3965