chore(main): release guestd 0.3.0

[github-actions]

🤖 I have created a release beep boop

0.3.0 (2026-06-25)

Features

• build EROFS rootfs image in CI and release (e209bc6)
• mark build-rootfs.sh executable (3a247f8)

Bug Fixes

• add MMDS host route (a36be5f)
• add MMDS host route for Firecracker metadata access (f66986b)
• apply cargo fmt to ESSENTIAL_MOUNTS (622498a)
• apply cargo fmt to ESSENTIAL_MOUNTS (71871c6)
• cargo fmt on network.rs import (834fc93)
• cargo fmt on network.rs import (1651687)
• create sbin dir before install in build-rootfs.sh (021a2d4)
• create sbin directory before installing guestd (4d70977)
• remove --all-time flag (unsupported in erofs-utils 1.7.1) (2cdd9ea)
• remove --all-time flag unsupported by erofs-utils 1.7.1 (92af900)
• remove blank line in MountError enum, fix rustfmt config (3964520)
• remove create_dir_all from mount_essential (c653c1d)
• remove create_dir_all from mount_essential (0c8c40a), closes #18
• remove unused RouteMessage import (36321d2)
• remove unused RouteMessage import (afaa3f5)
• strip mounts to proc only, minimal rootfs hierarchy (944cf71)
• strip mounts to proc only, minimal rootfs hierarchy (a058fe4)
• use read instead of read_to_end for MMDS response (a18dfaf)
• use read instead of read_to_end for MMDS response (1a312ee)
• write boot errors to vsock log channel before exit (8e007d4)
• write boot errors to vsock log channel before exit (a4e7533)

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[t0gun]

Closing — config fix incoming. Release Please will open a clean PR with correct tag format.