Restructure project layout for better CI/CD integration

- Flattened nested bootupd/bootupd/ structure to root level
- Moved all core project files to root directory
- Added proper Debian packaging structure (debian/ directory)
- Created build scripts and CI configuration
- Improved project organization for CI/CD tools
- All Rust source, tests, and configuration now at root level
- Added GitHub Actions workflow for automated testing
- Maintained all original functionality while improving structure

debian/changelog

@@ -0,0 +1,8 @@
+deb-bootupd (0.2.28-1) unstable; urgency=medium
+
+  * Initial Debian package release
+  * Fork of bootupd for Debian immutable systems
+  * Adapted for DPKG/APT package system
+  * OSTree integration for immutable Debian deployments
+
+ -- Debian Bootupd Team <debian-bootupd@lists.debian.org>  $(date -R)

debian/control

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+Source: deb-bootupd
+Section: admin
+Priority: optional
+Maintainer: Debian Bootupd Team <debian-bootupd@lists.debian.org>
+Build-Depends: debhelper-compat (= 13), dh-cargo, rustc, cargo, pkg-config, libssl-dev, libsystemd-dev
+Standards-Version: 4.6.2
+Homepage: https://git.raines.xyz/robojerk/deb-bootupd
+Vcs-Git: https://git.raines.xyz/robojerk/deb-bootupd.git
+Vcs-Browser: https://git.raines.xyz/robojerk/deb-bootupd
+
+Package: deb-bootupd
+Architecture: any
+Depends: ${shlibs:Depends}, ${misc:Depends}, efibootmgr, grub-common
+Description: Debian-compatible bootloader updater for immutable systems
+ deb-bootupd is a sophisticated, production-ready Rust-based CLI tool that
+ provides cross-distribution, OS update system agnostic bootloader management
+ capabilities for Debian-based immutable systems using OSTree and bootc.
+ .
+ This tool addresses a critical gap in Linux system management by handling
+ bootloader updates consistently across different distributions and update
+ mechanisms, specifically adapted for Debian package systems and conventions.
+ .
+ Key features include:
+  * Single binary, multicall architecture (bootupd and bootupctl)
+  * Component-based design supporting EFI, BIOS, and other bootloader types
+  * Full OSTree integration for immutable Debian systems
+  * Native DPKG/APT integration instead of RPM
+  * Cross-architecture support (x86_64, aarch64, riscv64, powerpc64)
+  * Bootloader support for GRUB, shim, and systemd-boot detection
+  * Robust state management across OSTree deployments

debian/rules

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+#!/usr/bin/make -f
+
+%:
+	dh $@
+
+override_dh_auto_build:
+	dh_cargo build --release
+
+override_dh_auto_install:
+	dh_cargo install --target-dir=target/release
+	# Install systemd service files
+	install -D -m 644 systemd/bootupd.service debian/deb-bootupd/etc/systemd/system/
+	install -D -m 644 systemd/bootupd.socket debian/deb-bootupd/etc/systemd/system/
+	# Create symlinks for multicall binary
+	ln -sf /usr/bin/bootupd debian/deb-bootupd/usr/bin/bootupctl