Update image.bzl to optionally utilize new createImageConfig Go binary (#1063)
Update image.bzl to optionally utilize new createImageConfig Go binary (#1063)

* Update image.bzl to optionally utilize new createImageConfig Go binary

* extract helper functions for two image config creation binaries

* implement optional argument in bazel rule for new go config creator.

* fix buildifier error

bazelbuild/rules_docker,bazelbuild/rules_docker,bazelbuild/rules_docker,bazelbuild/rules_docker