bundle.Dockerfile path should be parameterized

Feature Request

bundle.Dockerfile path should be parameterized

Describe the problem you need a feature to resolve.

Currently bundle.Dockerfile by default generates at root directory of project.

Olm also expect dockerFile along the bundle dir.see

Currently we have to copy this file manually and edit the relative path of the content like manifest and metadata path.

Describe the solution you'd like.

It would be better if we could define --bundle.Dockerfile path and its name as input arg to operator-sdk generate bundle cmd

/language go