start snapshot distribution

[patrickwwbutler]

Motivation

Tips for reviewer

Checklist

• This PR has adequate test coverage / QA involvement has been duly considered. (trigger-ci for additional test/nightly runs)
• This PR has an associated up-to-date design doc, is a design doc (template), or is sufficiently small to not require a design.
• If this PR evolves an existing $T ⇔ Proto$T mapping (possibly in a backwards-incompatible way), then it is tagged with a T-proto label.
• If this PR will require changes to cloud orchestration or tests, there is a companion cloud PR to account for those changes that is tagged with the release-blocker label (example).
• If this PR includes major user-facing behavior changes, I have pinged the relevant PM to schedule a changelog post.

[github-actions]

Thank you for your submission! We really appreciate it. Like many source-available projects, we require that you sign our Contributor License Agreement (CLA) before we can accept your contribution.

You can sign the CLA by posting a comment with the message below.

---

I have read the Contributor License Agreement (CLA) and I hereby sign the CLA.

---

1 out of 2 committers have signed the CLA.
✅ (patrickwwbutler)[https://github.com/patrickwwbutler]
❌ @patrick Butler
Patrick Butler seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}