Add workflow to release hybridsim nightly.

[tonyjohnchen]

Description

1. Set up v4-8 TPU runner for this project to take any workflow that need TPU
2. Add a workflow to release hybridsim nightly with gcloud sdk and python3.10 support.

Tests

Please describe the tests that you ran on Cloud VM to verify changes.

Instruction and/or command lines to reproduce your tests: ...

List links for your tests (use go/shortn-gen for any internal link): ...
Tested in workflow
https://screenshot.googleplex.com/9fUqW5HDzUDBPti

Checklist

Before submitting this PR, please make sure (put X in square brackets):

• I have performed a self-review of my code.
• I have necessary comments in my code, particularly in hard-to-understand areas.
• I have run one-shot tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed.

[RissyRan]

Could you wrap nightly_release_utils in a folder of multipod or have a prefix of the folder? Also please feel free to add owners to this folder here. So any changes will be needed approval from your team.

[will-cromar]

I'm not sure about this PR. This workflow has (as near as I can tell) no relation to the content in this repository. Are you building this image to consume in a test workflow down the line? cc @jonb377 who was looking into this

What's the TPU self hosted runner for? I don't see any part of this workflow that actually utilizes a TPU device.

IMO you would be much better off creating a scheduled Cloud Build workflow. This is more in-line with internal guidance (search "fewer build services" internally). See https://cloud.google.com/build/docs/schedule-builds and https://cloud.google.com/build/docs/build-push-docker-image for instructions to get set up with GCB. GCB also makes permission management easier -- I assume you had to generate a temporary service account token to set up GHA, and you'd have to periodically rotate that token.

[tonyjohnchen]

Could you wrap nightly_release_utils in a folder of multipod or have a prefix of the folder? Also please feel free to add owners to this folder here. So any changes will be needed approval from your team.

Done.