Builder Image Scripts Directory Location

[otaviof]

Certain s2i builder-images need a alternative location for the workflow scripts, i.e.:

$ s2i build --help |grep image-scripts-url
      --image-scripts-url string         Specify a URL containing the default assemble and run scripts for the builder image (default "image:///usr/libexec/s2i")

The s2i Tasks rendered by this project should as well support this configuration accordingly, like for instance an additional param.

[otaviof]

Given we have support the s2i flag, this can be closed.