update docker-compose model server restart

[sanjuruk]

Fix model server restarting issue on a reboot

Description

Issue: model server do come online when machine is rebooted
Fix: update model server restart to always and change exit 0 to sleep infinity

How Has This Been Tested?

Locally

Accepted Risk (provide if relevant)

N/A

Related Issue(s) (provide if relevant)

#1604
Slack: https://danswer.slack.com/archives/C056265VB1N/p1732571338118389

Mental Checklist:

• All of the automated tests pass
• All PR comments are addressed and marked resolved
• If there are migrations, they have been rebased to latest main
• If there are new dependencies, they are added to the requirements
• If there are new environment variables, they are added to all of the deployment methods
• If there are new APIs that don't require auth, they are added to PUBLIC_ENDPOINT_SPECS
• Docker images build and basic functionalities work
• Author has done a final read through of the PR right before merge

Backporting (check the box to trigger backport action)

Note: You have to check that the action passes, otherwise resolve the conflicts manually and tag the patches.

• This PR should be backported (make sure to check that the backport attempt succeeds)

[vercel]

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