Feature request: Add --mtime option to git archive

From: Raul E Rangel <rrangel@chromium.org>
Date: Feb 16, 2023, 19:41 UTC
Message-ID: <Y+6G9n6cWRT9EKyl@google.com>

When generating a tarball with `git archive <tree>`, `git archive` will use the current time as the mtime. This results in a non-hermetic tarball. Could we should add a --mtime option that allows passing in the time?

Thanks!

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