The decoupled build workflow (PR #4471) removed the Railway deploy
trigger, assuming environmentPatchCommit auto-update would handle
deploys. Not all services have auto-update configured, so GHCR images
were pushed but Railway never pulled them. Restore the explicit
serviceInstanceRedeploy call after each GHCR push.
The old "Showcase: Build & Deploy" workflow used a single concurrency group
that cancelled in-flight builds on every push to main. When multiple PRs
merged in quick succession, most service builds got cancelled and never
deployed.
Split into two workflows:
1. showcase_build.yml ("Showcase: Build & Push") - triggered on push to main,
builds Docker images and pushes to GHCR. Has NO concurrency group so every
run completes. Railway auto-update picks up the new :latest tag.
2. showcase_deploy.yml ("Showcase: Verify Deploy") - triggered by workflow_run
from the build workflow. Polls Railway to verify each service picked up the
new image and is healthy. Uses cancel-in-progress since verification is
idempotent. Posts results to showcase-harness via webhook.
Also updates showcase_capture-previews.yml to trigger from the renamed build
workflow.
Jordan Ritter