Auto-detect ARG in Containerfile and pre-fill build page

[cdrage]

Is your feature request related to a problem? Please describe

Follow up from: #7250

When we load the Containerfile, we should look for the ARG and pre-fill the argument list within the Build Image page.

This is beneficial for any Containerfiles that require ARG's to be passed in (public ssh key, usernames, passwords, etc.) in order to build the image.

Describe the solution you'd like

Read the Containerfile, get any ARG and pre-fill the build image page.

Describe alternatives you've considered

No response

Additional context

No response