Copyright (c) 2017 Roland Singer [[email protected]] Shamelessly borrowed from @r0l1's awesome work that is available at https://gist.github.com/r0l1/3dcbb0c8f6cfe9c66ab8008f55f8f28b.

environment variable for experimental features, expecting "true" lower case.

value to remove default selector inheritance to sub-helmfiles and use the explicit one.