feat(dpkg): add dpkg to base rpm repo

[tobiasb-ms]

In commit 8d904bb we added debootstrap, putting it in the base rpm repo. But we missed dpkg, which is a dependency of debootstrap. This change adds dpkg to the base rpm repo.

Built locally and installed via local yum repo. Both dpkg and debootsrap install correctly.

[Copilot]

Pull request overview

This PR adds dpkg to the base-packages component group in base/comps/components-publish-channels.toml. By default all components publish to the rpm-sdk channels; membership in the base-packages group overrides this so the package (and its runtime closure) publishes to the rpm-base channels instead. This is a follow-up to commit 8d904bb which added debootstrap to the base repo but omitted dpkg, a runtime dependency of debootstrap, so debootstrap could not be satisfied from rpm-base alone.

Changes:

• Add "dpkg" to the component-groups.base-packages list so it is published to the rpm-base channel rather than the default rpm-sdk channel.

Verification notes:

• dpkg is already a defined component (base/comps/components.toml:351), so no new component definition is required.
• The insertion preserves the required alphabetical ordering (dpdk < dpkg < dracut), matching the convention noted in the file header comment.
• This is a publish-channel-only change; it does not alter dpkg's rendered spec or lock file, so no render/update refresh is needed.
• Consistent with how debootstrap itself was added to this group (line 220).