ci: retire the frontend image build

[aleksdotbar]

Frontend image builds belong to constructorfabric/insight, which owns the
sources under src/frontend/. Two publishers race the mutable latest tag;
this leaves one.

• Image name and tag format unchanged — charts, values and environment
  overlays need no edit.
• GHCR retention for the insight-front package stays here.
• Comment-only edits in ci.yml, trivy.yml, ghcr-cleanup.yml drop
  references to the removed file.
• ci.yml, semgrep.yml, trivy.yml, trufflehog.yml keep gating open PRs.

⚠️ Do not merge until the cutover is ready. Nothing publishes the frontend
image between this landing and the monorepo building it — latest freezes at
the last build.

Refs constructorfabric/insight#1818

[coderabbitai]

📝 Walkthrough

Walkthrough

The .github/workflows/docker.yml file is deleted, removing Docker build, scan, and publish steps from this repository. Comments in ci.yml, ghcr-cleanup.yml, and trivy.yml are updated to reference the external constructorfabric/insight workflow for image publishing and scanning instead of docker.yml.

Changes

Workflow documentation update after docker.yml removal

Layer / File(s)	Summary
Remove docker.yml workflow .github/workflows/docker.yml	Deletes the entire Docker build, GHCR authentication, caching, Trivy scanning, and umbrella chart dispatch workflow.
Update workflow comments to reference external publisher .github/workflows/ci.yml, .github/workflows/ghcr-cleanup.yml, .github/workflows/trivy.yml	Comments in these files now reference the constructorfabric/insight publishing workflow and its trivy-images.yml job instead of the deleted docker.yml.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• constructorfabric/insight-front#158: Modifies the umbrella chart dispatch logic contained in the docker.yml file that this PR deletes.
• constructorfabric/insight-front#225: Added the Trivy image-scanning job to docker.yml that this PR removes, and relocates its documentation.
• constructorfabric/insight-front#227: Modified branch-tagged Docker image builds in docker.yml, which this PR deletes.

Suggested reviewers: ktursunov

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the primary change: retiring the frontend image build from this repository.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/retire-frontend-image-build

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