Rory Hunter ce7ebb2d39
Limit _FILE env var support to specific vars (#52645)
Backport of #52525.

Closes #52503. Implement a list of `_FILE` env vars that will be used to
populate env vars with file content, instead of processing all `_FILE`
vars in the environment.
2020-02-21 19:36:15 +00:00
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