fix(WORKDIR): use the config.User for the new dir permissions #2269
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Fixes #2259, probably #477, probably #1340 (does not repro anymore)
Description
WORKDIR ignores the currently set USER and creates the new directories with the root user ownership.
This changes that, by executing a chown after the mkdir if needed, and also handle the case where the provided USER is an uid and the passwd file is not available to resolve to the username.
The PR contains a smoke integration test as the container-diff cannot yet check file ownership (GoogleContainerTools/container-diff#308) - it just makes sure the build does not error out for various cases and that the diff looks good.
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