[server] Run yarn prod in landing in setup.sh script
[server] Run yarn prod in landing in setup.sh script

Summary:
This bash script is called by `deploy.sh`, which is run to deploy the latest GitHub state to production.

We need to include this line to make sure `landing.build.cjs` gets generated.

Test Plan: run the command

Reviewers: atul

Reviewed By: atul

Subscribers: KatPo, palys-swm, Adrian

Differential Revision: https://phabricator.ashoat.com/D1079

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