Add secondary group impersonation w/ !cgo support #1164
Merged
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TL;DR: PR is a bit funky so as to support !cgo builds, such as what we use in the Kaniko image.
Without cgo, Go is not able to use getgroups() to resolve group information. This PR falls back to parsing /etc/group with the same logic as what is used in Go's source tree, but adds secondary group information.
Integration tests will require some hand-holding.
Fixes #1097