Deprecate Postgresql13 image for RHEL8

[ndavidova]

Summary by CodeRabbit

• Removed Support

  • Removed PostgreSQL 13 for RHEL 8 from available image tags/build configurations.
  • PostgreSQL 13 RHEL 8 images are no longer included in the RHEL 8 upgrade path or matrix entries.

• Documentation

  • Updated phrasing about RHEL Application Streams lifecycle support in PostgreSQL image READMEs.

• Tests

  • Adjusted upgrade test validation to reflect supported RHEL 8 versions: PostgreSQL 12, 15, and 16.

[coderabbitai]

📝 Walkthrough

Walkthrough

PostgreSQL 13 is removed from RHEL 8 image definitions, build configuration, ImageStreams, and upgrade paths. README wording is updated across PostgreSQL versions 12, 13, 15, 16, and 18.

Changes

RHEL 8 PostgreSQL 13 removal

Layer / File(s)	Summary
Remove image publication and build entries imagestreams/*, 13/Dockerfile.rhel8, specs/multispec.yml	PostgreSQL 13 is removed from RHEL 8 ImageStream tags, version lists, the build matrix, and its Dockerfile.
Update upgrade test paths test/conftest.py, test/run_test	RHEL 8 upgrade sequences now skip PostgreSQL 13.
Adjust lifecycle documentation and version listings 12/.../README.md, 13/.../README.md, 15/.../README.md, 16/.../README.md, 18/.../README.md, README.md	Application Streams wording is revised, and the RHEL 8 PostgreSQL 13 registry entry is removed from the versions table.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: phracek

🚥 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 matches the main change: deprecating the PostgreSQL 13 image for RHEL 8.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch eol_pg13_rhel8

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[github-actions]

Pull Request validation

Failed

🔴 Failed or pending statuses:

• CodeRabbit[pending]

🔴 Review - Missing review from a member (1 required)

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Triggered by Workflow Run

[phracek]

@ndavidova Postgresql is dist-gen generated container. You have to modify dist-gen files.

[ndavidova]

[test]

[github-actions]

Testing Farm results

name	compose	arch	status	started (UTC)	time	logs
Fedora - 16	Fedora-latest	x86_64	✅ passed	29.07.2026 13:01:01	10min 1s	test pipeline
CentOS Stream 10 - 16	CentOS-Stream-10	x86_64	✅ passed	29.07.2026 13:01:01	11min 48s	test pipeline
Fedora - 15	Fedora-latest	x86_64	✅ passed	29.07.2026 13:01:00	10min 6s	test pipeline
CentOS Stream 9 - 13	CentOS-Stream-9	x86_64	✅ passed	29.07.2026 13:01:02	12min 8s	test pipeline
RHEL8 - 12	RHEL-8.10.0-Nightly	x86_64	✅ passed	29.07.2026 13:01:01	15min 23s	test pipeline
CentOS Stream 9 - 16	CentOS-Stream-9	x86_64	✅ passed	29.07.2026 13:01:01	14min 20s	test pipeline
RHEL8 - 16	RHEL-8.10.0-Nightly	x86_64	✅ passed	29.07.2026 13:01:00	17min 29s	test pipeline
RHEL8 - 15	RHEL-8.10.0-Nightly	x86_64	❌ error	30.07.2026 09:49:18	19min 47s	test pipeline
RHEL10 - Unsubscribed host - 16	RHEL-10.2-Nightly	x86_64	✅ passed	29.07.2026 13:01:00	20min 34s	test pipeline
RHEL9 - Unsubscribed host - 13	RHEL-9.8.0-Nightly	x86_64	✅ passed	29.07.2026 13:01:06	21min 38s	test pipeline
RHEL10 - 16	RHEL-10.2-Nightly	x86_64	✅ passed	29.07.2026 13:01:04	21min 25s	test pipeline
RHEL9 - 15	RHEL-9.8.0-Nightly	x86_64	✅ passed	29.07.2026 13:01:00	23min 23s	test pipeline
RHEL9 - 16	RHEL-9.8.0-Nightly	x86_64	✅ passed	29.07.2026 13:01:01	23min 32s	test pipeline
RHEL10 - 18	RHEL-10.2-Nightly	x86_64	✅ passed	29.07.2026 13:01:06	23min 11s	test pipeline
RHEL9 - Unsubscribed host - 18	RHEL-9.8.0-Nightly	x86_64	✅ passed	29.07.2026 13:01:10	23min 37s	test pipeline
CentOS Stream 9 - 15	CentOS-Stream-9	x86_64	✅ passed	29.07.2026 13:11:29	12min 45s	test pipeline
RHEL9 - 18	RHEL-9.8.0-Nightly	x86_64	✅ passed	29.07.2026 13:01:08	24min 25s	test pipeline
CentOS Stream 9 - 18	CentOS-Stream-9	x86_64	✅ passed	29.07.2026 13:13:31	13min 29s	test pipeline
RHEL10 - Unsubscribed host - 18	RHEL-10.2-Nightly	x86_64	✅ passed	29.07.2026 13:11:25	22min 4s	test pipeline
RHEL9 - 13	RHEL-9.8.0-Nightly	x86_64	✅ passed	30.07.2026 09:49:18	24min 43s	test pipeline

[github-actions]

Testing Farm results

name	compose	arch	status	started (UTC)	time	logs
Fedora - 18	Fedora-latest	x86_64	✅ passed	29.07.2026 13:01:03	9min 6s	test pipeline