- Merged docker-backend, docker-runner, docker-ui, docker-caddy into a
single 'docker' job. Docker Hub is now authenticated once; the credential
in ~/.docker/config.json is reused by all four build-push-action steps.
Eliminates 3 redundant login, checkout, setup-buildx, and scheduler
round-trips. Builds still run sequentially within the job so inline layer
cache pushes don't race each other.
- docker-ui now downloads the plain ui-build artifact from check-ui directly
(previously it depended on upload-sourcemaps which produced ui-build-injected).
- release job now only needs: [docker] instead of the previous 5-job list.
- Entire upload-sourcemaps job commented out as requested. Re-enable by
uncommenting the job block and adding 'upload-sourcemaps' back to the
docker job's needs list (also swap ui-build → ui-build-injected artifact).
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