2026.1: Purge references to RL9 from GH workflow files

[Alex-Welsh]

Removes all references to RL9 from GitHub workflow files in the repo, and where appropriate, replaces them with RL10

I also removed a few 2025.1 references while I was there, but that's largely out of scope for this PR. I'll go through again in the future to check them properly

Summary by CodeRabbit

• New Features

  • Added Rocky Linux 10 support for IPA, overcloud host, container, OFED, and multinode image workflows across x86_64 and aarch64.
  • Rocky Linux 10 is now the default base image and multinode host operating system.
  • Rocky Linux 10 images can be promoted, uploaded, and published through the existing workflows.

• Changes

  • Removed Rocky Linux 9 build, upload, promotion, and publication options.
  • Updated branch references and image-tag workflows for the 2026.1 release line.
  • Ubuntu 24.04 Noble support remains available.

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In @.github/workflows/update-overcloud-host-image-tags.yml:
- Line 54: Update the checkout step in the workflow to use the invoking branch
via github.ref_name instead of the hardcoded stackhpc/2025.1 ref, while leaving
the generated branch name based on the existing image-tag inputs unchanged.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0108746 and 9716ecb.

📒 Files selected for processing (13)

• .github/workflows/ipa-image-build.yml
• .github/workflows/ipa-image-promote.yml
• .github/workflows/overcloud-host-image-build.yml
• .github/workflows/overcloud-host-image-promote.yml
• .github/workflows/overcloud-host-image-upload.yml
• .github/workflows/package-build-ofed.yml
• .github/workflows/stackhpc-build-kayobe-image.yml
• .github/workflows/stackhpc-container-image-build.yml
• .github/workflows/stackhpc-multinode.yml
• .github/workflows/stackhpc-update-kolla.yml
• .github/workflows/trigger-overcloud-host-image-build.yml
• .github/workflows/update-dependencies.yml
• .github/workflows/update-overcloud-host-image-tags.yml