Deprecate postgres-13 job: removal scheduled for next release

[ZPascal]

Summary

Marks the `postgres-13` job as deprecated ahead of its removal in the next bosh release.

• `jobs/postgres-13/spec` — adds deprecation notice to the job description
• `jobs/postgres-13/templates/pre-start.erb` — emits a `WARNING` log line during `bosh deploy` so operators see it

Operators should migrate to cloudfoundry/postgres-release. See `docs/postgres-migration.md` (added in a companion PR) for the full migration guide.

Related PRs

This is one of three independent PRs split from the original postgres-release migration:

• This PR: postgres-13 deprecation warning (PR Deprecate postgres-13 job: removal scheduled for next release #2778)
• Companion: BRATS & CI/CD integration for postgres-release versions 15/16/17/18 (PR Add BRATS matrix tests for postgres-release versions 15/16/17/18 #2779)
• Companion: Remove postgres job, packages, and blob-bumping CI (PR Remove postgres job and packages; replace with postgres-release #2764)

Test plan

• `bosh deploy` with `postgres-13` job produces the deprecation WARNING in logs

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 119d121e-265c-4b47-8a31-5f2fdeb8da9b

📥 Commits

Reviewing files that changed from the base of the PR and between c7e7e2b and 537c42e.

📒 Files selected for processing (2)

• jobs/postgres-13/spec
• jobs/postgres-13/templates/pre-start.erb

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Walkthrough

The postgres-13 job metadata now marks the job as deprecated and directs users to the upstream postgres job and migration documentation. Its pre-start script also prints deprecation and migration warnings before continuing.

Suggested reviewers: aramprice

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly states the main change: deprecating postgres-13 and its next-release removal.
Description check	✅ Passed	The description covers the summary, related PRs, and test plan, but leaves several template sections unfilled.
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.

✨ Finishing Touches

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• Create PR with unit tests

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[Copilot]

Pull request overview

This PR deprecates the postgres-13 BOSH job ahead of its scheduled removal, by surfacing the deprecation both in the job metadata and during deployment/startup so operators see a clear migration signal.

Changes:

• Adds a deprecation warning message to the postgres-13 job pre-start script output.
• Adds a description field to jobs/postgres-13/spec marking the job as deprecated and directing operators to migrate.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
jobs/postgres-13/templates/pre-start.erb	Emits deprecation warning lines when the job runs its pre-start hook.
jobs/postgres-13/spec	Marks the job as deprecated via the job spec description string.

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