Create generic project runbook

[tublitzed]

When ready with generic version, customize it for Durable Sync and make sure it's easily accessible for all.

Things to include:

• a checklist for issues like say, the rust logging problem we ran into for autopush in prod, and durable sync in stg. Possibly even setup integration tests like the one suggested here to make sure we don't accidentally break this again.

• a release calendar here that we can share with QA.

• a guide for dependency upgrades (ie, get them on a regular cadence so we don't get too far behind)

Useful references:

• Existing release guide for autopush
• WebPush Operations Runbook
• Push Services Partner Runbook

[jrconlin]

Need runbooks for:

• [ ] autopush
• [ ] channelserver
• [ ] pushbox
• [ ] syncstorage-rs
• [ ] megaphone

[tublitzed]

draft skeleton here - will share out for review and then once we think we've included all the bits we'd like to see, I'll start filling this in for projects, beginning with durable sync.