feat(ci): publish dc-ros and dc-uploader images to ghcr

[Minipada]

Summary

• Adds production Containerfiles for dc-ros and dc-uploader (containers/dc-ros/, containers/dc-uploader/) — thin layers over the already-tested dc-workspace image, with no E2E-only content (no workload generator, no test params), each with its own minimal entrypoint.
• Adds build-dc-ros-image and build-dc-uploader-image CI jobs that build and push both images to ghcr.io, tagged with the commit :<sha> and a floating :latest, gated to push events on jazzy only (never a PR build) — the first runnable images this repo publishes, per CLAUDE.md's convention.
• Adds a verify-published-images job (tools/release/scripts/verify_published_images.sh) that pulls the just-published dc-ros/dc-uploader images plus the public Vector image and runs the three-container topology with zero local podman build, proving a Record flows from dc-ros through vector into Postgres and that dc-uploader starts cleanly off DC_UPLOADER_* env vars alone.
• Fixes the Vector image tag / vector_vendor pin drift risk: compose.split.yaml's vector service now interpolates VECTOR_VERSION (derived from ros2_data_collection.repos, same grep four sibling E2E scripts already use) instead of hardcoding 0.57.0; run_split.sh exports it.

Closes #448

Test plan

• prek run --all-files --skip build-doc (hadolint, shellcheck, REUSE, ruff, etc.) passes locally
• hadolint/shellcheck run directly against the new Containerfiles/scripts
• CI: build-dc-ros-image, build-dc-uploader-image, and verify-published-images run and go green on push to jazzy

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.44%. Comparing base (1e48007) to head (4d08db0).
⚠️ Report is 1 commits behind head on jazzy.

Additional details and impacted files

@@           Coverage Diff           @@
##            jazzy     #462   +/-   ##
=======================================
  Coverage   71.44%   71.44%           
=======================================
  Files         124      124           
  Lines        7563     7563           
=======================================
  Hits         5403     5403           
  Misses       2160     2160           

Flag	Coverage Δ
cpp-jazzy	71.44% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.