v2025.6

This release stabilizes a new compose rootfs build workflow which is intended for use in container multi-stage builds; for more see its use in fedora-bootc.

There are also some minor tweaks for the rechunking tooling. The existing rechunking done as part of rpm-ostree compose image is stable, but we aim to stabilize the "separate rechunker" currently exposed via rpm-ostree experimental build-chunked-oci in a later release.

What's Changed

• compose-rootfs: Fix gpgkey= with Fedora examples by @cgwalters in #5293
• build-chunked-oci: Propagate creation timestamp with --from by @cgwalters in #5297
• build(deps): bump cxx from 1.0.137 to 1.0.141 by @dependabot in #5300
• build(deps): bump cxx-build from 1.0.136 to 1.0.141 by @dependabot in #5298
• compose: Stabilize compose rootfs by @cgwalters in #5296
• container-encapsulate: Two patches by @cgwalters in #5301
• chunking: Add some error context by @cgwalters in #5305
• chunking: Fix working as rootful by @cgwalters in #5306
• compose-rootfs: Also set xattrs on target root by @cgwalters in #5308
• Bump to latest bootc by @cgwalters in #5309
• chunking: two minor patches by @cgwalters in #5312
• treefile: Set RPMOSTREE_WORKDIR for finalize.d by @cgwalters in #5313
• compose-rootfs: Don't output ostree-container format by @cgwalters in #5315
• compose: Add compose install --postprocess by @cgwalters in #5316
• Release 2025.6 by @cgwalters in #5321

Full Changelog: v2025.5...v2025.6