Alerts: wire up worker image releases

Current status — deferred

This work is parked, not completed, and is not a blocker for the next development slice. Revisit before production rollout.

Automatic worker image releases/promotion are deferred. Changes to an enabled worker fleet still need an explicit verified release/promotion path; do not assume later source changes reach workers automatically.

Scope

Wire worker image releases for #97317 using the current release pipeline conventions.

Release names:

• temporal-worker-alerts-product-evaluation
• temporal-worker-alerts-product-delivery

Remaining

• Trace the current image-build/release path and add or confirm both fleets' path filters and dispatch/release configuration.
• Confirm an image containing the merged workflows and schedule can reach each enabled dev fleet.
• Record evidence that a later source change produces the expected release/freight for both fleets.
• Keep promotion limited to environments already rolled out; no production activation here.

Merged dev onboarding: PostHog/charts#15461. Schedule: #99141 / #97448. Deployment verification: PostHog/charts#15371.

Cleanup inspection found no alerts-product entries in .github/workflows/container-images-cd.yml on master. That is not proof of a missing release path elsewhere; trace the current pipeline before implementing or closing this issue.

Trace the current image-build and release path, starting with .github/workflows/container-images-cd.yml and the related dispatch or release configuration. Check the filters and release behavior for temporal-worker-alerts-product-evaluation and temporal-worker-alerts-product-delivery, then verify that a later source change produces the expected release evidence for both enabled dev fleets without activating production.