docs(changelog): version 1.9.0 [citest skip]

[richm]

Update changelog and .README.html for version 1.9.0

Signed-off-by: Rich Megginson rmeggins@redhat.com

Summary by Sourcery

Release version 1.9.0 with container build support and CI enhancements.

New Features:

• Add support for using the role in container builds

CI:

• Roll out several recent CI testing changes
• Add openSUSE Leap support to the qemu/kvm test matrix
• Enable EPEL feature for testing farm
• Upgrade tox-lsr to 3.12.0 for osbuild_config.yml
• Switch __bootc_validation output to JSON
• Bump actions/github-script from v7 to v8

Documentation:

• Update CHANGELOG.md and README.html for version 1.9.0

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR prepares the project for the 1.9.0 release by adding a new section in CHANGELOG.md with the featured change and CI updates, and by updating version references in the README HTML.

File-Level Changes

Change	Details	Files
Introduce 1.9.0 release notes	Add a new [1.9.0] section with release date List the container builds support feature (feat: Support this role in container builds #245) Enumerate recent CI enhancements and tooling bumps (ci: rollout several recent changes to CI testing #241–ci: bump actions/github-script from 7 to 8 #248)	CHANGELOG.md
Bump version references in documentation	Update displayed version number to 1.9.0 Refresh download links/badges for the new release Ensure changelog link points at the updated entry	.README.html

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