[ULS]: Add --bump mode to update_lt_spec.py for non-rebase spec updates

[bmastbergen]

Adds a --bump flag for updating the spec when commits have been added without rebasing to a new upstream kernel version.

Bump mode (--bump):

• Parses N from the current ciq_kernel-X.Y.Z-N tag and increments it
• Updates %define pkgrelease from N to N+1 and resets %define buildid to .1, so the tarball name changes (e.g. linux-6.18.21-2.1.el9)
• Prepends a new changelog entry above existing ones using commits since the last ciq_kernel tag as the log range; the changelog version uses .1 directly since buildid is always reset to .1 on bump
• Optionally commits (--commit) and creates the new ciq_kernel-X.Y.Z-N+1 tag (--tag); --tag requires --commit, prints a warning if used without --bump, and is skipped with a warning if --commit made no changes

Rebase mode now also resets %define pkgrelease back to 1%{?buildid} so the release counter returns to 1 for the new kernel version.

New helpers in ciq_helpers.py:

• parse_ciq_tag_release(): extracts N from ciq_kernel-X.Y.Z-N tags
• parse_kernel_tag(): extended to accept ciq_kernel-X.Y.Z-N format
• prepend_spec_changelog(): inserts a new entry at the top of %changelog
• replace_spec_changelog(), prepend_spec_changelog(): raise ValueError instead of silently no-oping when %changelog is not found
• read_spec_el_version(): reads %define values from spec lines; delegates to private _read_spec_define() which builds the regex from name + a value-capture pattern to avoid duplication
• _set_spec_pkgrelease(): updates the numeric base of a %define pkgrelease line; shared by update_spec_file() and bump_spec_file()

[Copilot]

Pull request overview

Adds a new “bump” workflow to update_lt_spec.py to support updating kernel.spec when new commits land without a full upstream rebase, along with new/expanded helpers in ciq_helpers.py to parse CIQ tags and manipulate the spec changelog.

Changes:

• Introduces --bump mode to increment the CIQ release counter (N), bump %define pkgrelease, reset %define buildid to .1, and prepend a changelog entry based on commits since the last CIQ tag.
• Adds optional --tag behavior (gated by --commit) to create a new ciq_kernel-X.Y.Z-(N+1) tag after a successful bump commit.
• Extends ciq_helpers.py with CIQ tag parsing and new changelog/spec helpers, and makes changelog replacement/prepend raise on missing %changelog.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
update_lt_spec.py	Adds bump mode, tagging support, and refactors spec read/write + pkgrelease update behavior.
ciq_helpers.py	Adds CIQ tag release parsing, changelog prepend helper, and spec %define reader.

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