devenv: Add skopeo and fsverity-utils for bootc/composefs testing

[cgwalters]

These are dependencies needed for bootc and composefs testing:

• skopeo: container image inspection/copy tool (same package name on both Debian and CentOS, added to packages-common.txt)
• fsverity-utils: filesystem verity utilities for composefs. On Debian the binary package is 'fsverity' (added to packages-debian.txt). On CentOS Stream 10 the package is not yet in the base repos, so we install it directly from Koji build 2949299.

Assisted-by: OpenCode (Claude claude-opus-4-6)

[gemini-code-assist]

Summary of Changes

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This pull request enhances the development environment by incorporating essential tools required for bootc and composefs testing. It ensures that skopeo is available across all environments and specifically addresses the inclusion of fsverity-utils for both Debian and CentOS Stream 10, facilitating comprehensive testing of container images and filesystem integrity features.

Highlights

• skopeo integration: Integrated skopeo, a container image inspection and copy tool, into the common development environment packages for bootc and composefs testing.
• fsverity-utils for Debian: Added fsverity to the Debian-specific package list to support composefs testing.
• fsverity-utils for CentOS Stream 10: Implemented a direct installation of fsverity-utils and libfsverity from Koji for CentOS Stream 10, as the package is not yet available in its base repositories.

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Changelog

• devenv/Containerfile.c10s
  • Added a RUN command to install fsverity-utils and libfsverity directly from Koji for CentOS Stream 10.
• devenv/packages-common.txt
  • Added skopeo to the list of common packages.
• devenv/packages-debian.txt
  • Added fsverity to the list of Debian-specific packages.

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[gemini-code-assist]

Code Review

This pull request adds skopeo and fsverity-utils as dependencies for testing purposes. However, the installation of fsverity-utils on CentOS Stream 10 directly from Koji without explicit GPG signature or checksum verification introduces a potential supply chain risk. While the source is trusted, this practice bypasses standard security mechanisms. A specific suggestion has been provided for devenv/Containerfile.c10s to address this and improve maintainability.