We don't want people to accidentally run commands on prod thinking they were on
Alpha / Sandbox.
To do that - we add 2 safeguards:
1) when on prod, the shell has a strong RED "PRODUCTION" in the commandline, while on alpha/sandbox it's green.
2) if a prod shell is idle for > 1h, it exits. So don't accidentally use a prod shell from a long time ago.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=191931731
013558c814