"Extra args" input

[tetchel]

Presently, if there is some option the user wants to pass to buildah that we don't have an input for, they are out of luck.

Tekton solves this problem with an "extra args" option that the user can put any extra args they like into and they are just appended to the buildah command.

https://github.com/tektoncd/catalog/blob/master/task/buildah/0.2/buildah.yaml

[tetchel]

because of the way we have to run many commands in the non-dockerfile case, this does not work as well as I thought it would. after discussion with divyanshu, we are not going to implement this.

[divyansh42]

I think we should do this for build with dockerfile case, as it seems to be genuine requirement.